I arranged that dying after the game was already completed didn't

increment the deaths counter. In doing so, I incorrectly handled the
borderline case, so that a death incurred _in the act_ of collecting
the final gem also didn't increment the deaths counter. Now it does.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@6277 cda61777-01e9-0310-a592-d414129be87e