shell: Whitespaces cleanup
shell: Whitespaces cleanup

Signed-off-by: Quentin Glidic <241385a0e41ea713327e189bce1062decf7c1eb5@sardemff7.net>

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