fix test_typing

Author: T4rk1n

@plotly/dash-generator-test-component-typescript/dash_prop_typing.py

@@ -1,14 +1 @@
 ignore_props = ['ignored_prop']
-
-custom_imports = {
-    "*": ["import json"]
-}
-
-def generate_style(*_):
-    return "dict"
-
-custom_props = {
-    "*": {
-        "obj": generate_style
-    }
-}