Util: Fix getting sub-scene's root path

Cuurently, it prepends the "/root/" to the node's name as the path, if
the node is the scene's root node. But, the absolute path reference
points to nothing and leads NULL accessment. So, do not reform the path
for the root node of the scene.

addons/block_code/ui/util.gd

@@ -39,11 +39,6 @@ static func node_scene_path(node: Node, reference: Node, path_root: Node = null)
 	if node.unique_name_in_owner:
 		# With unique_name_in_owner, just use the % prefixed name.
 		return NodePath("%%%s" % node.name)
-	elif node.is_ancestor_of(reference):
-		# If the node is an ancestor of the reference, it would begin
-		# with an ugly ../. Use an absolute path where /root is the
-		# path_root node.
-		return NodePath("/root/%s" % path_root.get_path_to(node))
 	else:
 		# The node is reference or a child of it. Use a relative path.
 		return reference.get_path_to(node)