Fix block-models not being loaded if they are directly in the root models folder

Author: TBlueF

BlueMapCore/src/main/java/de/bluecolored/bluemap/core/resources/resourcepack/ResourcePack.java

@@ -238,7 +238,6 @@ private void loadResources(Path root) throws IOException {
                                 .map(path -> path.resolve("models"))
                                 .flatMap(ResourcePack::list)
                                 .filter(path -> !path.getFileName().toString().equals("item"))
-                                .filter(Files::isDirectory)
                                 .flatMap(ResourcePack::walk)
                                 .filter(path -> path.getFileName().toString().endsWith(".json"))
                                 .filter(Files::isRegularFile)
@@ -420,7 +419,6 @@ private static Stream<Path> list(Path root) {
     }
 
     private static Stream<Path> walk(Path root) {
-        if (!Files.isDirectory(root)) return Stream.empty();
         try {
             return Files.walk(root);
         } catch (IOException ex) {