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* RtlTimeEstimator: Consider minimum ground speed This fixes an issue seen when the wind is faster than the trim airspeed, but not faster than the max airspeed. In that case the RTL time estimator currently assumes that we always fly at trim airspeed and are thus unable to cover ground in the upwind direction. The result is a very large RTL time estimate, resulting in RTL if configured by COM_FLTT_LOW_ACT. By considering the FW_GND_SPD_MIN parameter, we correct this wrong assumption. The RTL remaining time estimate now becomes realistic in this situation. * RtlTimeEstimator: assume min ground speed of 5 if param unavailable