[master] ADSB contacts do not appear in the GPS View

[stronnag]

ADSB contacts are supposed (IIRC) to be shown in the GPS tab (ast least from my pre-kindergarten understanding of JS).

When tested against a validated simulation, no such contacts are shown.

Testing methodology.

• Describes test steps (SITL or FC)
• Provides link to data capture for replay.

[stronnag]

Fixed by #2089