Inav 2.2 Stable PIDs in OSD do not display FF for fixed wing

[ShawnzAZ]

Current Behavior

PIDs in the OSD just shows 0 for D, does not display FF for Fixed Wing.

Steps to Reproduce

1. Setup Inav for fixed wing
2. show PIDs in OSD

Expected behavior

I'd expect to see FF values instead of the zeros for D or maybe a 4th column for FF.

Suggested solution(s)

FF value in D column or add a 4th column for FF.

Additional context

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• FC Board name and vendor: Matek F722-Wing
• INAV version string:

INAV/MATEKF722SE 2.2.0 Jun 18 2019 / 14:53:13 (5e5551b)

GCC-7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907]

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