Add Gear off/down to joystick special commands

[ekka]

" { down = iCommandPlaneGearDown, up = iCommandPlaneGearUp, cockpit_device_id = devices.GEAR_INTERFACE, value_down = 1.0, value_up = 0.0, name = _('Landing Gear Control Handle (special) - Down/Up'), category = {_('Special For Joystick'), _('Left Vertical Panel')}}, " You wonderful dev's have added every other command I needed apart from this one, if you could add the gear command it would stop me having to replace the file every update.