fix: enable transition from done phase to preflight phase

[Saschl]

Fixes #[issue_no]

Summary of Changes

Currently the plane never transitions to done phase, which prevented turnarounds from working properly as it was impossible to enter a new flightplan and performance data (the data is being cleared but the MFD fields are not editable). Added the logic to transition to preflight phase.

Not sure if this is the right way to approach this, suggestions welcome :)

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

1. Take off from the runway with the Perf page open on the MFD. Make sure the V speeds become read only.
2. Abort the takeoff, come to a halt and turn off the engines (ensure the APU is on so you still have power, to be on the safe side)
3. After the engines are below 20% N2, the mfd should switch automatically to the status page.
4. Switch to INIT or fuel/load or perf page again and make sure all the fields can be filled again
5. A full flight doing the same checks would be welcome as well of course

How to download the PR for QA

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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

[Saschl]

Eventually, we could replace this with the publisher. Then we do not set this in two places.

[G-DRAW]

The above sounds very good. I have a few suggestions, during landing the FMS should also reset to the Status page automatically 30 seconds after landing.

[G-DRAW]

The FMS on the A380 can also transition from and to any flight phase. Hope this helps.

[G-DRAW]

#9498 (comment)

[Saschl]

Thanks a lot for the input 👍 I think the missing switch to the status page on FMS2 can be addressed in another PR, as this one is meant to allow for turnarounds in the first place. We will look into that for sure