fix reposition: set acceptance radius
fix reposition: set acceptance radius

Previously the acceptance radius was 0, so the FlightTaskAutoLine was
randomly changing yaw and sometimes going into a random direction.
There is still something else wrong in there, but avoids the reposition
problem.

acfloria/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,Aerotenna/Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,PX4/Firmware,dagar/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,PX4/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,Aerotenna/Firmware,krbeverx/Firmware,Aerotenna/Firmware,PX4/Firmware,krbeverx/Firmware,PX4/Firmware