desktop-shell: Fix coding style of add_popup_grab
desktop-shell: Fix coding style of add_popup_grab

Signed-off-by: Jonas Ådahl <67dcd8a17e758192e0cbb577ce1d62cc7da6cf49@gmail.com>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

Fantu/compositor-spice,mchalupa/weston,Gnurou/weston,Tarnyko/weston-xdg_surface_present,xorgy/weston,udoprog/weston,giucam/weston,sir-murray/weston,Fantu/compositor-spice,udoprog/weston,kwm81/weston,eyolfson/weston,eyolfson/weston,sir-murray/weston,xorgy/weston,kwm81/weston,Gnurou/weston,jonnylamb/weston,krezovic/weston,mchalupa/weston,krezovic/weston,Tarnyko/weston-xdg_surface_present,Fantu/compositor-spice,giucam/weston,jonnylamb/weston