egl/x11: Remove duplicate call to dri2_x11_add_configs_for_visuals

egl/x11: Remove duplicate call to dri2_x11_add_configs_for_visuals

The call to dri2_x11_add_configs_for_visuals (previously
dri2_add_configs_for_visuals) was moved downwards in commit f8c5b8a1,
but appeared again in its original position after its rename in
d019cd81. Remove it.

Cc: "10.5 10.6" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Boyan Ding <boyan.j.ding@gmail.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@intel.com>