Coup de gras failed for paralysed targets as skills are checked on wrong participant

[RMTEW FULL NAME]

The code which considers paralysis of a target as valid for coup de gras checked skills on the actor, rather than the victim. This needs to be rectified.

[RMTEW FULL NAME]

The code which considers paralysis of a target as valid for coup de gras checked skills on the actor, rather than the victim. Reported by Felius@Bay12, with handy save file. Fixes #201

→ <<cset bf81f891728e>>