Copter: RTL's ignore pilot yaw should apply to all stages of RTL

# Bug Report If the user set RTL_OPTIONS = 2 (Ignore Pilot Yaw) the yaw is still consumed during the final stage of the RTL (e.g. landing). I think the correct interpretation is that we should ignore the pilot's input during all stages of RTL. This is quite easy to reproduce in SITL: 1. ./Tools/autotest/sim_vehicle.py --map --console 2. param set RTL_OPTIONS 2 (to ignore pilot yaw) 3. GUIDED 4. arm throttle 5. takeoff 20 6. RTL 7. rc 4 1000 At this point the vehicle will yaw when it should not I think the bug was introduced many years ago by PR https://github.com/ArduPilot/ardupilot/pull/21651 This issue was raised in [this 4.7 beta testing thread](https://discuss.ardupilot.org/t/rc-options-to-1-make-copter-yaw-spinning/142948/16). **Version** 4.6, 4.7, 4.8 and earlier **Platform** [ ] All [ ] AntennaTracker [x] Copter [ ] Plane [ ] Rover [ ] Submarine **Airframe type** Copter **Logs** available in the discussion linked above