The tags of the dive site were shown/hidden when changing the
current dive.
Thus the following could happen:
1) User changes to dive with no tags. Tags are hidden.
2) User add image, which creates GPS tag
3) Tag is updated but not shown.
Fix this by showing/hiding tags when they are calculated not
when switching the dive.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
ce7cc79705