fullscreen-shell: update for manual surface/view mapping
fullscreen-shell: update for manual surface/view mapping

This is a follow up for fullscreen-shell to manually
set mapped status for views/surfaces it controls

v2:

- Add manual mapping to fs_output_apply_pending()

Signed-off-by: Armin Krezović <31ec4b88003c779f400d1506dcff569d5faae2fb@gmail.com>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

sir-murray/weston,sir-murray/weston,krezovic/weston,krezovic/weston