[IMP] point_of_sale: add hw_blackbox_be to posbox image

This removes server_wide_modules from odoo.conf entirely because it
wasn't actually used.

addons/point_of_sale/tools/posbox/configuration/odoo.conf

@@ -3,4 +3,3 @@ data_dir = /var/run/odoo
 log_level = error
 logfile = /var/log/odoo/odoo-server.log
 pidfile = /var/run/odoo/odoo.pid
-server_wide_modules = web,hw_proxy,hw_posbox_homepage,hw_posbox_upgrade,hw_scale,hw_scanner,hw_escpos

addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init.d/odoo

@@ -26,7 +26,7 @@ test -x $DAEMON || exit 0
 set -e
 
 function _start() {
-    start-stop-daemon --start --quiet --pidfile $PIDFILE --chuid $USER:$USER --background --make-pidfile --exec $DAEMON -- --config $CONFIG --logfile $LOGFILE --load=web,hw_proxy,hw_posbox_homepage,hw_posbox_upgrade,hw_scale,hw_scanner,hw_escpos
+    start-stop-daemon --start --quiet --pidfile $PIDFILE --chuid $USER:$USER --background --make-pidfile --exec $DAEMON -- --config $CONFIG --logfile $LOGFILE --load=web,hw_proxy,hw_posbox_homepage,hw_posbox_upgrade,hw_scale,hw_scanner,hw_escpos,hw_blackbox_be
 }
 
 function _stop() {