Switch the mobile code to use the constraint-based filter. The one
thing that is still commented out is dive-site mode, since mobile
doesn't (yet) have a dive-site edit feature. And even if it had,
the dive list probably wouldn't be shown at the same time.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
634e26cbce