Revert "xwayland/glx: Enable sRGB fbconfigs"

Commit 6c1e6429 breaks a lot of tests in the VK-GL-CTS deqp_gles31
profile.

This reverts commit 6c1e6429.

Closes: xorg/xserver#1225
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
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