Fix query

crates/lavina-core/src/repo/room.rs

@@ -7,24 +7,21 @@ impl Storage {
     #[tracing::instrument(skip(self), name = "Storage::is_room_member")]
     pub async fn is_room_member(&self, room_id: u32, player_id: u32) -> Result<bool> {
         let mut executor = self.conn.lock().await;
-        let res: (bool,) = sqlx::query_as(
+        let res: (u32,) = sqlx::query_as(
             "
-            select
-                exists (
-                    select
-                        count(*)
-                    from
-                        memberships
-                    where
-                        user_id = ? and room_id = ?
-                );
+                select
+                    count(*)
+                from
+                    memberships
+                where
+                    user_id = ? and room_id = ?;
                 ",
         )
         .bind(player_id)
         .bind(room_id)
         .fetch_one(&mut *executor)
         .await?;
-        Ok(res.0)
+        Ok(res.0 > 0)
     }
 
     #[tracing::instrument(skip(self), name = "Storage::add_room_member")]