fix general background color

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/res/values/styles.xml

@@ -43,6 +43,7 @@
         <item name="bottomSheetDialogTheme">@style/ThemeOverlay.App.BottomSheetDialog</item>
         <item name="popupMenuStyle">@style/ChatSendButtonMenu</item>
         <item name="dialogCornerRadius">@dimen/dialogBorderRadius</item>
+        <item name="android:windowBackground">@color/bg_default</item>
     </style>
 
     <style name="ThemeOverlay.AppTheme.PopupMenu" parent="ThemeOverlay.Material3.Dark">
@@ -294,5 +295,4 @@
         <item name="cornerSize">50%</item>
     </style>
 
-
 </resources>