Plane: RCOU.C_ logs incorrectly on boot until when safety switch not activated

#### Issue details
RCOU.C1 and all of the rest jump between 0 and neutral-ish unitl the safety switch is pressed.


#### Version
Plane 3.9 Beta 1

#### Platform
[ ] All
[ ] AntennaTracker
[ ] Copter
[X] Plane
[ ] Rover
[ ] Submarine

#### Airframe type
All

#### Hardware type
Cube autopilot

#### Logs
https://www.dropbox.com/s/ikuqniqgqodr109/00000008.BIN?dl=0

Start by reviewing the provided Plane 3.9 Beta 1 BIN log and reproducing the behavior on the Cube autopilot before the safety switch is pressed. Trace where RCOU.C1 and the other RCOU.C fields are logged during boot. Done means the RCOU.C values remain correct and stable before safety-switch activation, without changing their behavior afterward.

Written by the indexing model from the issue text.