EventFnArgMismatch is raised on event_chain

[LeoGrosjean]

Describe the bug
In event.call_event_fn release 0.6.0

...
# Check that fn signature matches arg_spec
fn_args = inspect.getfullargspec(fn).args
n_fn_args = len(fn_args)
if isinstance(fn, types.MethodType):
    n_fn_args -= 1  # subtract 1 for bound self arg
parsed_args = parse_args_spec(arg_spec)
if len(parsed_args) != n_fn_args:
    raise EventFnArgMismatch(
        "The number of arguments accepted by "
        f"{fn} ({n_fn_args}) "
        ...
        f"{[str(v) for v in parsed_args]}\n"
        "See https://reflex.dev/docs/events/event-arguments/"
    )
...

This code will raise EventFnArgMismatch when we pass an object of type EventSpec because it don't check default argument !

To Reproduce
Steps to reproduce the behavior:

rx.select.root(
    rx.select.trigger("Pick a techno !"),
    rx.select.content(
        rx.select.group(
            rx.select.item(
                "Home", value="/"
            ),
            rx.select.item(
                "Home2", value="not empty"
            ),
        ),
    ),
    value=State.router.page.path,
    on_change=rx.redirect,
)

Expected behavior
Not raising the exception EventFnArgMismatch !

Specifics (please complete the following information):

• Python Version: 3.9, 3.10
• Reflex Version: 0.6.0
• OS: windows

Additional context
Add any other context about the problem here.

[masenf]

Fixed in 0.6.1