Revert "[android]Remove grey color on place page buttons layout"

This reverts commit 142759c4d0.

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

@@ -4,7 +4,7 @@
   android:id="@+id/pp_buttons_layout"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
-  android:background="?ppBackground"
+  android:background="?ppButtonsBackground"
   android:orientation="horizontal"
   android:layout_gravity="bottom">
   <include layout="@layout/divider_horizontal" />

android/app/src/main/res/values/themes-attrs.xml

@@ -16,6 +16,7 @@
     <attr name="iconTintActive" format="color" />
     <attr name="iconTintLight" format="color" />
     <attr name="ppBackground" format="color" />
+    <attr name="ppButtonsBackground" format="color" />
     <attr name="navNextTurnFrame" format="reference" />
     <attr name="navNextNextTurnFrame" format="reference" />
     <attr name="navLanesBackgroundColor" format="reference" />

android/app/src/main/res/values/themes-base.xml

@@ -42,6 +42,7 @@
     <item name="dividerHorizontal">@color/divider</item>
 
     <item name="ppBackground">@color/bg_cards</item>
+    <item name="ppButtonsBackground">?panel</item>
 
     <item name="navNextTurnFrame">@drawable/bg_nav_next_turn</item>
     <item name="navNextNextTurnFrame">@drawable/bg_nav_next_next_turn</item>
@@ -178,6 +179,7 @@
     <item name="dividerHorizontal">@color/divider_night</item>
 
     <item name="ppBackground">@color/bg_cards_night</item>
+    <item name="ppButtonsBackground">@color/bg_window_night</item>
 
     <item name="navNextTurnFrame">@drawable/bg_nav_next_turn_night</item>
     <item name="navNextNextTurnFrame">@drawable/bg_nav_next_next_turn_night</item>