Fix message find by date

flanabot/bots/flana_bot.py

@@ -168,12 +168,12 @@ class FlanaBot(MultiBot, ABC):
         last_2s_messages = Message.find({
             'platform': self.platform.value,
             'author': message.author.object_id,
-            'last_update': {'$gte': datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(seconds=2)}
+            'date': {'$gte': datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(seconds=2)}
         })
         last_7s_messages = Message.find({
             'platform': self.platform.value,
             'author': message.author.object_id,
-            'last_update': {'$gte': datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(seconds=7)}
+            'date': {'$gte': datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(seconds=7)}
         })
 
         if len(last_2s_messages) >= constants.FLOOD_2s_LIMIT or len(last_7s_messages) >= constants.FLOOD_7s_LIMIT: