load avatar again in CallNotificationActivity

was only disabled for debugging. still needs to be fixed with https://github.com/nextcloud/talk-android/issues/1234

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/activities/CallNotificationActivity.java

@@ -331,8 +331,7 @@ public class CallNotificationActivity extends BaseActivity {
     private void setUpAfterConversationIsKnown() {
         binding.conversationNameTextView.setText(currentConversation.getDisplayName());
 
-        // TODO: load avatar, but don't block UI!
-//        loadAvatar();
+        loadAvatar();
         checkIfAnyParticipantsRemainInRoom();
         showAnswerControls();
     }