Fixed total unread message count if deleted chat room contained unread messages

app/src/main/java/org/linphone/ui/main/viewmodel/AbstractMainViewModel.kt

@@ -113,6 +113,17 @@ open class AbstractMainViewModel
             }
         }
 
+        @WorkerThread
+        override fun onChatRoomStateChanged(
+            core: Core,
+            chatRoom: ChatRoom,
+            state: ChatRoom.State?
+        ) {
+            if (state == ChatRoom.State.Deleted) {
+                computeUnreadMessagesCount()
+            }
+        }
+
         @WorkerThread
         override fun onMessagesReceived(
             core: Core,