Android: remove SURFACE_TYPE_GPU, deprecated in API level 5.

https://developer.android.com/reference/android/view/SurfaceHolder

This constant was deprecated in API level 5. this is ignored, this value is set automatically when needed.
diff --git a/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java b/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java
index b4d5c46..71db555 100644
--- a/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java
+++ b/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java
@@ -1582,7 +1582,6 @@
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         Log.v("SDL", "surfaceCreated()");
-        holder.setType(SurfaceHolder.SURFACE_TYPE_GPU);
     }
 
     // Called when we lose the surface