Fix: Tests: Geometry Nodes tests ignore threshold value

Base constructor ask test name as the third argument,
so threshold have to be named parameter in case test name is not mentioned

Pull Request: https://projects.blender.org/blender/blender/pulls/134300

tests/python/modules/mesh_test.py

@@ -740,7 +740,7 @@ class BlendFileTest(MeshTest):
     """
 
     def __init__(self, test_object_name, exp_object_name, threshold=None):
-        super().__init__(test_object_name, exp_object_name, threshold)
+        super().__init__(test_object_name, exp_object_name, threshold=threshold)
         if bpy.data.objects[test_object_name].get("allow_index_change"):
             self.allow_index_change = True