Apply batch fixing of built-in types using var

osu.Game/Database/UserLookupCache.cs

@@ -37,7 +37,7 @@ namespace osu.Game.Database
         {
             var userLookupTasks = new List<Task<User>>();
 
-            foreach (var u in userIds)
+            foreach (int u in userIds)
             {
                 userLookupTasks.Add(GetUserAsync(u, token).ContinueWith(task =>
                 {