drm/client: s/drm_connector_has_preferred_mode/drm_connector_preferred_mode/

Drop the "has" from drm_connector_has_preferred_mode() to better
describe what it does.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240404203336.10454-3-ville.syrjala@linux.intel.com


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>