[ui] Fix the setting of `EnableInterpretGPSPacket` for an existing proxy
In the constructor of the dialog using an existing proxy :
- If the GPSProxy is null, we did not interpret GPS packet so we set
EnableInterpretGPSPacket
to false for consistency.\ - If the GPSProxy is not null, we are currently interpreting GPSPacket so we set
EnableInterpretGPSPacket
to True.
Edited by MelanieCarriere