Hotfix issue with wrong formatted barrier-block in 1.12

Author: TBlueF

BlueMapCore/src/main/resourceExtensions/assets/minecraft/blockstates/barrier.json

@@ -1,5 +1,5 @@
 {
     "variants": {
-        "": { "model": "block/barrier" }
+        "": { "model": "barrier" }
     }
 }