fix(a32nx/fws): Fix AP disconnection via 3D model inst. disc. push button

[flogross89]

Summary of Changes

Fixes issue with the 3D model instinctive disconnect button on the sidesticks (reported in a32nx-support)
Reference: https://discord.com/channels/738864299392630914/785976111875751956/1321142810010849302

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

A32NX only:

1. Start flight, no FMS setup needed
2. Engage autopilot
3. Disengage autopilot via the 3D model inst. disc. button on the sidestick. Press once to disengage, twice to silence the cavalry charge. Cav charge should be silenced with second press
4. Also verify disengaging autopilot still works with (joystick) keybinds

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, flybywire-aircraft-a380-842 (4K) or flybywire-aircraft-a380-842 (8K) download link at the bottom of the page

[kiwi2021]

Quality Assurance Report

Discord Username : Kiwi0.
Object of testing : #9695
Aircraft : A32NX
Tier of Testing : 1
Date : 31/12/2024

Testing Process:

1. Loaded aircraft onto runway
2. After takeoff, set autopilot
3. Disconnected A/P via model autopilot disconnect button
4. Pressed again shortly after to silence Cavalry and clear ECAM
5. Re-engaged A/P and disconnected via TCA Thrustmaster Joystick with keybind 'Set Autopilot Disengage'
6. Successful again both disconnect and Cavalry silence

Testing Results:
Passed

[tracernz]

Just needs changelog fixed.