Fix landscape generation bug introduced by 2c7d9c0549655134d4cf3c17511bdd2c3b7a9f20

<Sven2> Your fix of the parent check for points in the landscape.txt parser. if (!(pToNode->Type() == MCN_Overlay))
<Sven2> It should also allow the poly algo in maps
<Sven2> i.e., make it if (!(pToNode->Type() == MCN_Overlay) && !(pToNode->Type() == MCN_Map))
<Sven2> Actually, better make it if (!pToNode->Overlay())