Delete HLSL directory when copying Android assets.

Android/CopyData.bat

@@ -2,3 +2,4 @@ md assets\Data
 xcopy ..\Bin\Data\*.* assets\Data /S /E /C /Y
 md assets\CoreData
 xcopy ..\Bin\CoreData\*.* assets\CoreData /S /E /C /Y
+rd /S /Q assets\CoreData\Shaders\HLSL