feat(a380x/fcu): automatically select LS on LOC or APPR arming

[BravoMike99]

Fixes #9662

Summary of Changes

Automatically displays deviation scales on PFD once LOC or APPR FCU buttons are active.

Screenshots (if necessary)

References

In the original issue and https://youtu.be/_Dx3Ze6PUi4?t=14

Additional context

Discord username (if different from GitHub):
bruno_pt99

Testing instructions

1. With a valid localizer/ILS signal tuned press the APPR button on the FCU.
2. Verify deviation scales automatically appear on both PFDs and the "LS" light illuminates on both sides on the efis control panel.
3. Deselect LS on either side and repeat the previous process but with the LOC button.

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

[Jaronics]

Quality Assurance Trainee Report

Discord Username : Jaronics
Object of testing : #9670
Aircraft : A380X
Tier of Testing : 1
Date : 09/01/2025

Testing Process:

1. Performed ILS approach with LS buttons switched off
2. Engaged APPR mode
3. LS buttons illuminate and ILS scale was shown on both PFDs
4. Repeated same process for LOC mode

Testing Results:
Passed

Negatives:
None

Conclusions:
None

Media:
None