Copter fence: more visible on the map

More visible fence on the map can help under bright sunlight.

Signed-off-by: Quy Tonthat <qtonthat@gmail.com>
Copters: refresh home location when armed.

For a copter, HOME is where it's armed. Refresh waypoints when armed
to match the home position where the copter thinks that is. This will
reflects on the fence display on the map and any calculation related
to "home".

Signed-off-by: Quy Tonthat <qtonthat@gmail.com>