fix: skip game redirect when topic drift already handled

Changed if to elif so detected_game redirect only fires when
the topic_drift branch wasn't taken.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cogs/sentiment/__init__.py

@@ -443,8 +443,7 @@ class SentimentCog(commands.Cog):
                     db_message_id, self._dirty_users,
                 )
 
-            detected_game = finding.get("detected_game")
-            if detected_game and game_channels and not dry_run:
+            elif (detected_game := finding.get("detected_game")) and game_channels and not dry_run:
                 await handle_channel_redirect(
                     self.bot, user_ref_msg, detected_game, game_channels,
                     db_message_id, self._redirect_cooldowns,