Fix the CCW bug and add Altitude in LoiterN Dialog
LoiterN Bug fix

1. Fix CCW checkbox keep on resetting when reopening LOITER_N dialong
box.
2. add '-' to waypoint list when slectin non NAV command such as RTL,
GO_TO etc.
3, Fix bug Delay not updated in Waypoint Dialog
Merge pull request #287 from azrin1972/WPLoiterTAltitude

Waypoint Loiter N bug fixes