xmpp: Fix typo

xmpp_discord_bridge/main.py

@@ -243,7 +243,7 @@ class BridgeComponent(ComponentXMPP):
         }
 
         if self._relay_xmpp_avatars and self._avatars.get_avatar_url(message["from"]):
-            webhook["avatar_url"] = self._avatar.get_avatar_url(message["from"])
+            webhook["avatar_url"] = self._avatars.get_avatar_url(message["from"])
 
         # Look for mentions and replace them
         guild, channel = self._muc_map[muc]