X11: Disable screen shut off with VLC

# Turn off monitor modes that will power down,
# standby or blank the screen:
$ /usr/bin/xset -dpms
$ /usr/bin/xset s off
# Open VLC:
$ /usr/bin/vlc "$@"
# Re-enable modes:
$ /usr/bin/xset dpms
$ /usr/bin/xset s on