fixed issue when reacting to message triggered dynamic mention

src/bot/handler/dynamicMentionHandler.py

@@ -23,6 +23,9 @@ class DynamicMentionHandler(AbstractHandler):
         self.chat_repository = ChatRepository()
 
     def handle(self, update: Update, context: CallbackContext) -> None:
+        if update.message_reaction is not None:
+            return
+        
         users = self.chat_repository.get_users_for_group(self.inbound)
 
         Replier.markdown(update, MessageBuilder.mention_message(users))