Remove some usings that are not needed

Ryujinx.Graphics.Shader/Instructions/InstEmitVideo.cs

@@ -1,9 +1,7 @@
 using Ryujinx.Graphics.Shader.Decoders;
-using Ryujinx.Graphics.Shader.IntermediateRepresentation;
 using Ryujinx.Graphics.Shader.Translation;
 
 using static Ryujinx.Graphics.Shader.Instructions.InstEmitHelper;
-using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
 
 namespace Ryujinx.Graphics.Shader.Instructions
 {