Add default for needs_params src

src/replit/maqpy/utils.py

@@ -56,7 +56,7 @@ def needs_signin(func: Callable = None, login_html: str = sign_in_snippet) -> Ca
 
 def needs_params(
     *param_names: str,
-    src: Union[str, dict],
+    src: Union[str, dict] = "form",
     onerror: Callable[[str], flask.Response] = None,
 ) -> Callable:
     """Require paramaters before a handler can be activated.