Fix BUG 0001976

http://bugs.eressea.de/view.php?id=1976
Check that only buling owner set k_pay disable
If other unit inside the building set k_pay disable
it have now no effect, before only fraction was check

Conflicts:
	scripts/tests/eressea.lua

src/laws.c

@@ -4028,7 +4028,7 @@ int pay_cmd(unit * u, struct order *ord)
     p = getparam(u->faction->locale);
     if (p == P_NOT) {
       unit *owner = building_owner(u->building);
-      if (owner->faction != u->faction) {
+      if (owner->no != u->no) {
         cmistake(u, ord, 1222, MSG_EVENT);
       } else {
         u->building->flags |= BLD_DONTPAY;