e_desk: add a handler to update e_desk's geometry when the zone's geometry is changed

e_desk: add a handler to update e_desk's geometry when the zone's geometry is changed

The e_desk's geometry should be changed to its zone's geometry when the zone's geometry is changed.
(This code operates only if the e_config's use_desk_smart_object value is not set.)

Change-Id: I8ddfb2ff9973eea394c0ffcaeb72fe70b6bc297c