Demoness never drops loot - introduced in 13.5

[ansurfer]

In 13.5, the forced banishment of the Demoness was simplified to call the automatic banishment.
This was good refactoring, except that the Demoness is not auto-banish-loot-dropping.
So before the change, when the Demoness was force banished, she dropped loot. Now she doesn't.

Best fix would probably be to add

Definition: a demoness is auto-banish-loot-dropping:
if it is automatically banishable, decide no;
decide yes.