On the main-tab, when looking at a trip, the fields were filled
out with dive-data and then either hidden or overwritten with
trip data. Move the update of the fields into the corresponding
if-branch that is only active if on dive-mode.
This means removing the UPDATE_* macros, which updated or cleared
dive-fields depending on whether a current dive was set. These
operations are now performed explicitly in the corresponding
if-branches.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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