This broke after d58e917e2cb36c6ffcb259356c06171d8f6d4dcc in some situations, since it resulted in us calling wined3d_texture_download_from_texture() with CLEARED location. The latter was not aware of CLEARED and incorrectly assumed the source texture was in TEXTURE_SRGB.
-- v2: wined3d: Explicitly check for BUFFER/SYSMEM before calling wined3d_texture_download_from_texture(). wined3d: Propagate a CLEARED location when blitting.