Remove AutoDetectAndSetShaderMode method since it seems it does nothing

Except cause an exception because for some reason in one of the projects I get this:

```
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.Collections.Generic.List`1[T].get_Item (System.Int32 index) [0x00009] in :0
at ImmersiveVRTools.Editor.Common.WelcomeScreen.Utilities.AssetPathResolver.GetAssetFolderPathRelativeToScript (UnityEngine.ScriptableObject scriptableObject, System.Int32 folderDistanceFromFileRoot) [0x00022] in <9139b57e70db41b1b3e8ae7302e30088>:0
at FastScriptReload.Editor.FastScriptReloadPreference.SetCommonMaterialsShader (FastScriptReload.Editor.FastScriptReloadPreference+ShadersMode newShaderModeValue) [0x00001] in D:\git\borbeli\Assets\Plugins\Packages\handzlikchris.fastscriptreload\Source\Scripts\Editor\FastScriptReloadWelcomeScreen.cs:833
```

The reason I think it is not needed is that it calls FastScriptReloadPreference.SetCommonMaterialsShader which tries to set the shader on materials found in plugin's directory named Point but there are no materials in plugin's directory.