Fix code style

Author: EYHN

osu.Framework.Tests/Visual/Sprites/TestSceneAnimation.cs

@@ -15,7 +15,6 @@
 using osu.Framework.Graphics.Textures;
 using osu.Framework.IO.Stores;
 using osu.Framework.Testing;
-using osu.Framework.Text;
 using osu.Framework.Timing;
 
 namespace osu.Framework.Tests.Visual.Sprites