Remove unused variable

Author: peppy

osu.Game.Tests/Skins/TestSceneBeatmapSkinLookupDisables.cs

@@ -13,7 +13,6 @@
 using osu.Framework.Graphics.Textures;
 using osu.Framework.Testing;
 using osu.Game.Audio;
-using osu.Game.Configuration;
 using osu.Game.Rulesets.Osu;
 using osu.Game.Skinning;
 using osu.Game.Tests.Beatmaps;
@@ -30,9 +29,6 @@ public partial class TestSceneBeatmapSkinLookupDisables : OsuTestScene
         private BeatmapSkinSource beatmapSource;
         private SkinRequester requester;
 
-        [Resolved]
-        private OsuConfigManager config { get; set; }
-
         [SetUp]
         public void SetUp() => Schedule(() =>
         {