fix(adirs): fix ADIRS low speed warning discrete logic

[lukecologne]

Summary of Changes

This PR updates the ADR low speed warning discretes with the correct logic when unpowered or invalid, and also inverts the discrete 4. It also updates the usages of discrete 4 accordingly.

The logic is as follows (false is open circuit, true is ground):

• Discretes 1-3 are false when at low speed, and true when at high speed, while 4 is inverted.
• All discretes are false when the ADR is unpowered (represented by the IR selected knob being OFF)
• Discretes 1-3 remain in their previous state when the CAS is invalid but the ADR is powered (represented by the ADR p/b being off), while 4 is false in this case.

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

Currently the only usage of the discretes on the A32NX is for the L/G safety valve. The rest of the discretes are only used in the A380X.

• Confirm that the gear retraction/extension works correctly (and doesn't work correctly above the safety valve speed of 260kts)

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

[tracernz]

Gotta update the tests, and remove some unused code, otherwise LGTM.

[lukecologne]

Tests and dead code are fixed

[pilotseyea350]

Quality Assurance Tester/Trainee Report

Discord Username : PilotEyesA350
Object of testing : #8892
Aircraft : A32NX
Tier of Testing : 1
Date : 18/09/2024

Testing Process:

1. Spawn at EDDF RWY07C
2. Takeoff and fly RWY TRK
3. Accelerate to 190kts
4. Retract L/G
5. Extend L/G
6. Turn Right TRK246
7. Retract L/G
8. Extend L/G
9. Retract L/G
10. Accelerate to 270 IAS
11. Extend L/G
12. Observe L/G not extending
13. Use Gravity Extension Lever to extend L/G
14. Observe L/G Extended
15. Reset Gravity L/G extension
16. Try to Retract L/G
17. Observe L/G not retracting
18. Reduce to 240 IAS
19. Retract L/G

Testing Results:
Passed

Negatives:
N/A

Conclusions:
N/A

Media:
N/A