Handbrake doesn't deactivate flight when dematerialising #1067
Description
Reported by @catradorasustainsme in Discord:
Using the handbrake whilst in flight mode and dematerialising only cancels the demat, but doesn't deactivate flight mode at the same time. Nothing breaks code-wise, but it seems odd that the handbrake can only cancel thing one-at-a-time, rather than shutting them both down simultaneously.
It halts the TARDIS mid-air when doing it, too.