fix(mcdu): INIT B page - ZFW autofill unit conversion while boarding

[ShreyasKallingal]

Fixes #8758

Summary of Changes

Converts the desired ZFW autofill (always supplied in Kg) to the user unit (Lbs or Kg) during boarding.

Screenshots (if necessary)

N/A

References

N/A

Additional context

N/A

Testing instructions

Steps to reproduce (Copied from issue)

• set units in EFB to lbs
• set Pax on payload page to anything but zero
• start boarding
• try to load zfw/cg into INIT B page using the top right LSK
• observe that autofill zfw is in lbs and matches EFB payload page value

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

[Maximilian-Reuter]

Good Job!

[LunakisDev]

Quality Assurance Trainee Report

Discord: LunakisLeaks
Object of testing: #8760
Tier of Testing: 1
Date: 20/7/2024

Testing Process:

1. I set the units in EFB to lbs.

2. Set PAX on the payload page + start boarding

3. Loaded ZFW/CG into INIT B page using the top right LSK.

4. Verified that autofill ZFW is in LBS and matches EFB payload page value.

Negatives:
N/A

Testing Results:
Passed

Conclusions:
LGTM

[Maximilian-Reuter]

@ShreyasKallingal congrats on your first merged Contribution! Sadly you didnt add your discord Username to your PR so we cant assign you your Contributor role. If you message us on the discord we can get that sorted!