libpud: auto-correct owners
libpud: auto-correct owners

There was a strange bug reported on GitHub:
  https://github.com/jeanguyomarch/war2edit/issues/5
that showed a bug in Warcraft II. If empty players are
not controlled by nobody, then the scores menu would bug.

We therefore make sure we always set empty players to
PUD_OWNER_NOBODY.

war2/war2tools,war2/war2tools