switch all error logs to using *_err macros

src/service/admin.rs

@@ -1068,9 +1068,9 @@ impl Service {
                     if leave_rooms {
                         for &user_id in &user_ids {
                             if let Err(error) = leave_all_rooms(user_id).await {
-                                t::warn!(
+                                warn_err!(
+                                    error,
                                     %user_id,
-                                    %error,
                                     "failed to leave one or more rooms"
                                 );
                             }