The information tab used displayed_dive to fill out its field.
For consistency with the main tab and in a bigger effort to remove
displayed_dive, use current_dive instead.
Only clear the fields if no current_dive is set. The code used to
clear the fields and overwrite them later.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
98a3eb414b