[ReTrigger] add message reference to fake retrigger messages

retrigger/message.py

@@ -29,6 +29,7 @@ def __init__(self, *, message: discord.Message) -> None:
         self.channel = message.channel
         self.content = message.content
         self.guild = message.channel.guild  # type: ignore
+        self.reference = message.reference
         # this is required to fix an issue with cooldown commands
         self._edited_timestamp = message.created_at
         # this attribute being in almost everything (and needing to be) is a pain