Android: Use ElevationOverlay for app bar elevation color

Source/Android/app/src/main/res/layout/fragment_cheat_list.xml

@@ -10,7 +10,7 @@
         android:name="org.dolphinemu.dolphinemu.features.cheats.ui.CheatsDisabledWarningFragment"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:background="?attr/colorSurfaceVariant"
+        android:background="?attr/colorSurface"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="parent"
@@ -21,7 +21,7 @@
         android:name="org.dolphinemu.dolphinemu.features.cheats.ui.GraphicsModsDisabledWarningFragment"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:background="?attr/colorSurfaceVariant"
+        android:background="?attr/colorSurface"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@id/cheats_warning"

Source/Android/app/src/main/res/values/dimens.xml

@@ -7,4 +7,6 @@
     <dimen name="spacing_fab">72dp</dimen>
     <dimen name="menu_width">256dp</dimen>
     <dimen name="card_width">135dp</dimen>
+
+    <dimen name="elevated_app_bar">3dp</dimen>
 </resources>