No longer use an arbitrary offset to locate the correct map

src/main/java/net/minecraft/server/WorldMap.java

@@ -37,7 +37,6 @@ public class WorldMap extends WorldMapBase {
         // CraftBukkit start
         byte dimension = nbttagcompound.c("dimension");
 
-        if (dimension >= 10) {
         this.worldUID = nbttagcompound.getLong("WorldUID");
         CraftWorld world = (CraftWorld) server.getWorld(this.worldUID);
         // Check if the stored world details are correct.
@@ -48,7 +47,6 @@ public class WorldMap extends WorldMapBase {
         } else {
             dimension = (byte) world.getHandle().dimension;
         }
-        }
 
         this.map = dimension;
         // CraftBukkit end