mesa/formatquery: remove online compression check on is_resource_supported

mesa/formatquery: remove online compression check on is_resource_supported

is_resource_supported returns if the combination of
target/internalformat is supported in at least one operation. Online
compression is only mandatory for glTexImage2D. Some formats doesn't
support online compression, but can be used in any case, with
glCompressed*D methods.

Without this commit, ETC2 internalformats were returning FALSE, even
for the drivers supporting it. So any other query (like
TEXTURE_COMPRESSED) was returning FALSE/NONE instead of the proper
value.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>