Revert "common: Fix PBOs for 1D_ARRAY."

Revert "common: Fix PBOs for 1D_ARRAY."

This reverts commit 546aba143d13ba3f993ead4cc30b2404abfc0202.

I think the changes to the calls to glBlitFramebuffer from this patch
are no different to what it was doing previously because it used to
set height to 1 before doing the blits. However it was introducing
some problems with the blit for layer 0 because this was no longer
special cased. It didn't fix problems with the yoffset which needs to
be interpreted as a slice offset. I think a better solution would be
to modify the original if statement to cope with the yoffset.

Conflicts:
	src/mesa/drivers/common/meta_tex_subimage.c

Cc: "10.5" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>