elementary: Add missing EINA_UNUSED in combobox function
elementary: Add missing EINA_UNUSED in combobox function

_elm_combobox_elm_genlist_filter_set function does not use the Eo *obj
parameter so mark it as EINA_UNUSED to remove compiler warning

Signed-off-by: Chris Michael <2c9adca9bdb4861297f022d161a6a7c2d4597bd5@osg.samsung.com>

rvandegrift/elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary