Compressed texture not flipped when using "Prefer KTX" option

The "Flip compressed texture" is ignored and he KTX textures are not displayed properly if we are using the "Use ktx textures if available" option.

• If the KTX texture is applied explicitly to the object the texture is displayed as it should be.
• If the texture is applied as PNG and then the runtime uses the KTX the flipping of the texture is ignored
• On custom shaders the flipping of the texture is ignored
• Tested on VM/Linux and Target hardware
• Used ASTC or ETC2 compression for the test