Fix spawn markers

(Fallout from the arbitrary dimension name change)

overviewer_core/tileset.py

@@ -534,7 +534,8 @@ class TileSet(object):
         if isOverlay:
             d.update({"tilesets": self.options.get("overlay")})
 
-        if (self.regionset.get_type() == "overworld" and self.options.get("showspawn", True)):
+        # None means overworld
+        if (self.regionset.get_type() == None and self.options.get("showspawn", True)):
             d.update({"spawn": self.options.get("spawn")})
         else:
             d.update({"spawn": "false"});

overviewer_core/world.py

@@ -192,7 +192,7 @@ class World(object):
             spawnY = 255
         
         # Open up the chunk that the spawn is in
-        regionset = self.get_regionset("overworld")
+        regionset = self.get_regionset(None)
         if not regionset:
             return None
         try: