Cleanup: detangle unregister_dive() and delete_single_dive()

These two functions were called in different contexts:
- unregister_dive(): from the undo-commands to remove the dive
  from the global dive table, but not delete it. The dive was
  already removed from its trip.
- delete_single_dive(): from non-undo code. Most of it not in
  use and removed in a sibling-commit. Here, the dive is supposed
  to be removed from its trip and a new selection is calculated.

delete_single_dive() calls unregister_dive(), which removes the
dive from its trip. Move remove_dive_from_trip() from the former
to the latter and make both functions independent. Instead
of deleting the dive explicitly in delete_single_dive(), call
the delete_dive_from_table() function.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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