Removed unused usings. (#3593)

* Removed unused usings.

* Added back using, now that it's used.

* Removed extra whitespace.

Ryujinx.Graphics.Gpu/Shader/DiskCache/GuestCodeAndCbData.cs

@@ -1,5 +1,3 @@
-using Ryujinx.Graphics.Shader;
-
 namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
 {
     /// <summary>

Ryujinx.Graphics.Gpu/Shader/HashTable/PartitionHashTable.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Numerics;
 
 namespace Ryujinx.Graphics.Gpu.Shader.HashTable

Ryujinx.Graphics.Gpu/Shader/ShaderDumper.cs

@@ -1,4 +1,3 @@
-using Ryujinx.Graphics.Shader;
 using System.IO;
 
 namespace Ryujinx.Graphics.Gpu.Shader