Inav: Broken fixed_wing_auto_arm in version 2.2.1

[tadamox]

Current Behavior

CLI setting fixed_wing_auto_arm = ON does not allow to arm controller flashed with 2.2.0 or 2.2.1 version of INAV

Steps to Reproduce

1. Get Matek F405 wing
2. Do a clean update to version 2.2.0 or 2.2.1
3. Configure basic airplane mixer
4. Enable motor and servo output
5. Set fixed_wing_auto_arm = ON
6. Noting happens after rising throttle

Expected behavior

Motor starts spinning after rising throttle.
Version 2.1 works as expected

Suggested solution(s)

Return behavior as in version 2.1

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• FC Board name and vendor: Matek F405 Wing
• INAV version string: 2.2.0 and 2.2.1

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[hali9]

https://github.com/iNavFlight/inav/pull/4640#issuecomment-489354381 ?

[digitalentity]

@hali9 well spotted. Fixed by #4922