bin: force git show to use default pretty setting
I have pretty default to short, which breaks this script.
cc: Emil Velikov <emil.velikov@collabora.com>
cc: Andres Gomez <agomez@igalia.com>
cc: Juan A. Suarez <jasuarez@igalia.com>
Signed-off-by:
Dylan Baker <dylan.c.baker@intel.com>