Removes "save_player_data()"

As discussed in #9574.

Restoring a graveyarded file retains the map changes (broken window
through which a Hulk punched my Fragile testchar) and corpse, but no
Hulk.
Merge remote-tracking branch 'dda/pr/9663' into dda-master

* dda/pr/9663:
  Removes "save_player_data()"