[android] Remove grey background on some views

Signed-off-by: Jean-Baptiste <jeanbaptiste.charron@outlook.fr>

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

@@ -6,7 +6,6 @@
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
-  android:background="?windowBackgroundForced"
   android:animateLayoutChanges="true"
   android:clickable="true"
   android:clipToPadding="false"

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

@@ -6,7 +6,7 @@
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:layout_gravity="center"
   android:orientation="vertical"
-  android:background="?windowBackgroundForced"
+  android:background="?cardBackground"
   android:padding="@dimen/margin_base">
   <com.google.android.material.textview.MaterialTextView
     android:layout_width="match_parent"

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

@@ -7,6 +7,7 @@
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
+  android:background="?cardBackground"
   android:minHeight="@dimen/height_item_oneline"
   android:paddingStart="@dimen/margin_base_plus"
   android:paddingEnd="@dimen/margin_base_plus">

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

@@ -7,6 +7,7 @@
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
+  android:background="?cardBackground"
   android:minHeight="@dimen/height_item_oneline"
   android:paddingStart="@dimen/margin_base_plus"
   android:paddingEnd="@dimen/margin_base_plus">