check all corners of an object in e_comp_object_util_zone_get()
check all corners of an object in e_comp_object_util_zone_get()

if the top left corner is offscreen, checking other corners is still
valid for returning a useful zone

rvandegrift/e,rvandegrift/e,tasn/enlightenment,rvandegrift/e,tasn/enlightenment,tasn/enlightenment