amount_selected should never be decremented if already 0

this is probably more a workaround than a proper fix to a problem which
I think only happens if started with no dive loaded and then create one.
in that case, deselect_dive is called after saving the dive but probalby
before it was added to the dive list properly resulting in an underflow
of amount_selected.

Signed-off-by: Martin Gysel <me@bearsh.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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