Don't apply filter in readback, when there is no scaling

Fix check for scaling in SkiaOpenGLReadback: old code was not
taking into account that matrix rotation swaps width/height.

Test: Passed PixelCopyTest#testWindowProducerCopyToRGBA16F
Bug: 110097060
Change-Id: I0d26416fa72a026bc376417773d5a73548b1f1a5
1 file changed