intel/blorp: resize src and dst surfaces separately

When copying to an RGB surface, we treat it as an R only one of three times the width, which may end up being larger than the maximum size supported by the hardware and so it hits the shrink path. This forced both source and destination surfaces to be shrunk, even though it's not necessary for the former, and may even hit some assertions in some cases, such as the surface being compressed.

Fixes several tests under dEQP-VK.api.copy_and_blit.core.image_to_image.dimensions.*