Maintab: fix trip location / notes editing

Reusing the displayed_dive for this caused all kind of odd problems that
were hard to reproduce, because the behavior depended on what was in the
corresponding fields of the current_dive. Worse: the GPS location handling
prevented us from reliably removing the location of a trip.

The solution isn't ideal and certainly isn't elegant. Maybe we simply
shouldn't reuse the widget here. But I think what I have now works - I
tried hard to make it break again and couldn't.

Fixes #659

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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