When we start adding a dive, we actually create a diveAdd undo command
so we have a dive that the user can edit. Which means we need to undo
this action if we cancel.
Also, for a more consistent UI, we should pop the dive details page that
we used to edit this dive and bring the user back to the dive list.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
0301fc6905