Adjust permission request dialog colors in dark theme

Fixes #7252
Closes #7292

res/drawable/permission_rationale_dialog_corners.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
-    <solid android:color="@color/white"/>
+    <solid android:color="?attr/dialog_background_color"/>
     <corners android:radius="20dp"/>
 </shape>