fix(flaps): Fix flap index reported to msgs on the 380X

[crocket63]

Fixes #[issue_no]

Summary of Changes

Flap index fixed for flap 3 and flap FULL

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

Check global behavior with different flap configurations. Check auto land in flap full/flap 3 MSFS flap index similar should report 0 for no flaps, 1 or 2 for 1 or 1+F, 3 for position 2, 4 for conf3, 5 for conf FULL.

How to download the PR for QA

Every new commit to this PR will cause new A32NX and A380X artifacts to be created, built, and uploaded.

1. Make sure you are signed in to GitHub
2. Click on the Checks tab on the PR
3. On the left side, find and click on the PR Build tab
4. Click on either flybywire-aircraft-a320-neo or flybywire-aircraft-a380-842 download link at the bottom of the page