enhancement(lint): Fix lint errors for src/commands/on_user_join.ts

Co-authored-by: NeonGamerBot-QK <saahilattud@gmail.com>
Signed-off-by: zeon-neon[bot] <136533918+zeon-neon[bot]@users.noreply.github.com>

src/commands/on_user_join.ts

@@ -122,7 +122,7 @@ export default class UserJoinEvent implements Command {
               thread_ts: e.ts,
             });
             await new Promise((r) => setTimeout(r, t));
-            t +=  950;
+            t += 950;
           }
         });
     });