Updated docs/openbox

  * rc.org: removed keybind 'A-F4' (too common :);
  * (TOP)/data/openbox/alt.txt: updated (tangled from rc.org);
  * (TOP)/openbox/rc.xml: updated (tangled fro rc.org);
  * (TOP)/openbox/autostart: (manual update) removed start of 'blueman'.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>