## Bug description

Creating a selector with an attribute isn't working at all.

`[data-attr="bla"]`

## Expected behavior

It should work

## How to reproduce

1. Create action
2. Add an attribute in the selector
3. 


## Additional context

The reason for this is that we store the attributes as `attr__data-attr` but we do not add `attr__` in the filtering. I am working on a solution.


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posthog/test/test_event_model.py
def _signup_event(self, distinct_id: str):
        sign_up = Event.objects.create(
            distinct_id=distinct_id,
            team=self.team,
            event="$autocapture",
            elements=[Element(tag_name="button", text="Sign up!")],
        )
        return sign_up
    def _movie_event(self, distinct_id: str):
        event = Event.objects.create(
            distinct_id=distinct_id,
            team=self.team,
            event="$autocapture",
            elements=[
                Element(
                    tag_name="a",
                    attr_class=["watch_movie", "play"],
                    text="Watch now",
                    attr_id="something",
                    href="/movie",
                    order=0,
                ),
                Element(tag_name="div", href="/movie", order=1),
            ],
        )
        return event
    def test_simple_element_filters(self):