Only make render target 2D textures layered if needed (#2646)

* Only make render target 2D textures layered if needed

* Shader cache version bump

* Ensure topology is updated on channel swap

Ryujinx.Graphics.Gpu/Shader/ShaderCache.cs

@@ -40,7 +40,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
         /// <summary>
         /// Version of the codegen (to be changed when codegen or guest format change).
         /// </summary>
-        private const ulong ShaderCodeGenVersion = 2627;
+        private const ulong ShaderCodeGenVersion = 2646;
 
         // Progress reporting helpers
         private volatile int _shaderCount;