calibration_routines: fix 'Command denied during calibration' error message
calibration_routines: fix 'Command denied during calibration' error message

The uorb subscribe logic got changed for queued topics with
https://github.com/PX4/Firmware/pull/9436, meaning an orb_subscribe will
return past messages as well now.

This lead to an error 'Command denied during calibration' for the previously
received calibration start command.

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