[android] Unify custom map server dialog logic and UI

- Add setting icon for custom map server download option.
- Extract shared custom map server dialog helper.
- Clean up based on reviewers' feedback.

Signed-off-by: NoelClick <dev@noel.click>

android/app/src/main/res/drawable/ic_cloud_download.xml

@@ -0,0 +1,11 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:tint="?colorControlNormal"
+    android:height="24dp"
+    android:width="24dp"
+    android:viewportHeight="960"
+    android:viewportWidth="960">
+      
+    <path android:fillColor="@android:color/white"
+        android:pathData="M260,800Q169,800 104.5,737Q40,674 40,583Q40,505 87,444Q134,383 210,366Q227,294 295,229Q363,164 440,164Q473,164 496.5,187.5Q520,211 520,244L520,486L584,424L640,480L480,640L320,480L376,424L440,486L440,244Q364,258 322,317.5Q280,377 280,440L260,440Q202,440 161,481Q120,522 120,580Q120,638 161,679Q202,720 260,720L740,720Q782,720 811,691Q840,662 840,620Q840,578 811,549Q782,520 740,520L680,520L680,440Q680,392 658,350.5Q636,309 600,280L600,187Q674,222 717,290.5Q760,359 760,440L760,440L760,440Q829,448 874.5,499.5Q920,551 920,620Q920,695 867.5,747.5Q815,800 740,800L260,800ZM480,442Q480,442 480,442Q480,442 480,442L480,442Q480,442 480,442Q480,442 480,442L480,442Q480,442 480,442Q480,442 480,442L480,442Q480,442 480,442Q480,442 480,442Q480,442 480,442Q480,442 480,442L480,442Q480,442 480,442Q480,442 480,442Q480,442 480,442Q480,442 480,442L480,442L480,442Q480,442 480,442Q480,442 480,442Z"/>
+    
+</vector>

android/app/src/main/res/layout/activity_download_resources.xml

@@ -17,7 +17,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         app:icon="@drawable/ic_settings"
-        app:iconTint="?colorOnSurface"
+        app:iconTint="?iconTint"
         android:contentDescription="@string/download_resources_custom_url_title"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintEnd_toEndOf="parent"

android/app/src/main/res/layout/dialog_custom_map_server.xml

@@ -10,7 +10,8 @@
     android:paddingTop="@dimen/margin_base"
     android:paddingBottom="@dimen/margin_half"
     android:hint="@string/download_resources_custom_url_title"
-    app:placeholderText="@string/download_resources_custom_url_hint">
+    app:placeholderText="@string/download_resources_custom_url_hint"
+    app:endIconMode="clear_text">
 
   <com.google.android.material.textfield.TextInputEditText
       android:id="@+id/edit_custom_map_server"

android/app/src/main/res/values/strings.xml

@@ -967,13 +967,9 @@
     <string name="offline_explanation_text">A map needs to be downloaded to view and navigate the area.\nDownload maps for areas you want to travel.</string>
     <string name="list_description_empty">Edit the list to add a description</string>
     <!-- Custom Download URL -->
-    <string name="pref_custom_map_download_url_title">Custom Map Server</string>
-    <string name="pref_custom_map_download_url_summary">Override the default map download server used for map downloads. Leave empty to use CoMaps default server.</string>
-    <string name="pref_custom_map_download_url_hint">https://maps.comaps.app/</string>
-    <string name="download_resources_advanced">Advanced…</string>
     <string name="download_resources_custom_url_title">Custom Map Server</string>
     <string name="download_resources_custom_url_message">Override the default map download server used for map downloads. Leave empty to use CoMaps default server.</string>
-    <string name="download_resources_custom_url_hint">https://maps.comaps.app/</string>
+    <string name="download_resources_custom_url_hint">https://cdn-fi-1.comaps.app/</string>
     <string name="download_resources_custom_url_summary_none">Not set</string>
-    <string name="download_resources_custom_url_error_scheme">Please enter a full URL starting with http:// or https:// and ending with /.</string>
+    <string name="download_resources_custom_url_error_scheme">Please enter a full URL starting with https:// and ending with /</string>
 </resources>

android/app/src/main/res/xml/prefs_main.xml

@@ -214,8 +214,8 @@
       android:order="2"/>
     <Preference
         android:key="@string/pref_custom_map_download_url"
-        android:title="@string/pref_custom_map_download_url_title"
-        android:summary="@string/pref_custom_map_download_url_summary"
+        android:title="@string/download_resources_custom_url_title"
+        app:icon="@drawable/ic_cloud_download"
         android:order="3" />
 
   </androidx.preference.PreferenceCategory>