drm/tests: client: Remove extra blank lines

Some extra blank lines slipped through, remove them.

Fixes: 8fc0380f ("drm/client: Add some tests for drm_connector_pick_cmdline_mode()")
Reviewed-by: Maíra Canal <mairacanal@riseup.net>
Link: https://lore.kernel.org/r/20221116151833.1679379-1-maxime@cerno.tech


Signed-off-by: Maxime Ripard <maxime@cerno.tech>