feat(wake): Add not applicable to wake calculator display #426
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It was sometimes hard to tell when there wasn't a wake interval because
it couldn't be worked out (or because of a bug) and when there legitimately isn't one.
This makes the default display to be a double dash. If two aircraft are selected such that
no interval applies (e.g. LM followed by LM), it will instead display N/A which makes it clear
to the user that there is no applicable interval.
Resolves #425