Race dialog: remove incorrect assumption about numeric index in head/hair record IDs

apps/openmw/mwgui/race.cpp

@@ -128,11 +128,17 @@ namespace MWGui
         setRaceId(proto.mRace);
         recountParts();
 
-        std::string index = proto.mHead.substr(proto.mHead.size() - 2, 2);
-        mFaceIndex = boost::lexical_cast<int>(index) - 1;
+        for (unsigned int i=0; i<mAvailableHeads.size(); ++i)
+        {
+            if (mAvailableHeads[i] == proto.mHead)
+                mFaceIndex = i;
+        }
 
-        index = proto.mHair.substr(proto.mHair.size() - 2, 2);
-        mHairIndex = boost::lexical_cast<int>(index) - 1;
+        for (unsigned int i=0; i<mAvailableHairs.size(); ++i)
+        {
+            if (mAvailableHairs[i] == proto.mHair)
+                mHairIndex = i;
+        }
 
         mPreviewImage->setImageTexture (textureName);