Migrate to a new, updated popup bubble based on MaterialButton

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

app/src/main/java/com/nextcloud/talk/controllers/ChatController.kt

@@ -651,8 +651,7 @@ class ChatController(args: Bundle) :
             }
         }
 
-        binding.popupBubbleView.setTextColor(Color.WHITE)
-        binding.popupBubbleView.setIconTint(ColorStateList.valueOf(Color.WHITE))
+        viewThemeUtils.colorMaterialButtonPrimaryFilled(binding.popupBubbleView)
 
         binding.messageInputView.setPadding(0, 0, 0, 0)
 

app/src/main/java/com/nextcloud/talk/controllers/ConversationsListController.java

@@ -806,9 +806,7 @@ public class ConversationsListController extends BaseController implements Flexi
                 recyclerView.smoothScrollToPosition(nextUnreadConversationScrollPosition);
             }
         });
-
-        newMentionPopupBubble.setTextColor(Color.WHITE);
-        newMentionPopupBubble.setIconTint(ColorStateList.valueOf(Color.WHITE));
+        viewThemeUtils.colorMaterialButtonPrimaryFilled(newMentionPopupBubble);
     }
 
     private void checkToShowUnreadBubble() {