openmw.cfg location doesn't match

Currently OpenMW is searching for openmw.cfg in two locations. None of them match the location where the cmake script places the openmw.cfg file. This potentially also affects the launcher.

(RM-7 from redmine: created on 2011-08-06 by Lukasz Gromanowski, , closed on 2011-08-23 by Jan-Peter Nilsson)