## 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.


#### *Thank you* for your bug report – we love squashing them!

posthog/test/test_event_model.py
action2 = Action.objects.create(team=self.team)
        ActionStep.objects.create(action=action2, url="123", url_matching=ActionStep.CONTAINS)
        action3 = Action.objects.create(team=self.team)
        ActionStep.objects.create(
            action=action3, url="https://posthog.com/%/123", url_matching=ActionStep.CONTAINS,
        )
        action4 = Action.objects.create(team=self.team)
        ActionStep.objects.create(
            action=action4, url="/123$", url_matching=ActionStep.REGEX,
        )
        event1 = Event.objects.create(team=self.team, distinct_id="whatever")
        event2 = Event.objects.create(
            team=self.team,
            distinct_id="whatever",
            properties={"$current_url": "https://posthog.com/feedback/123"},
            elements=[Element(tag_name="div", text="some_other_text", nth_child=0, nth_of_type=0, order=1,)],
        )
        events = Event.objects.filter_by_action(action1)
        self.assertEqual(events[0], event2)
        self.assertEqual(len(events), 1)
        events = Event.objects.filter_by_action(action2)
        self.assertEqual(events[0], event2)
        self.assertEqual(len(events), 1)
        events = Event.objects.filter_by_action(action3)
        self.assertEqual(events[0], event2)
        self.assertEqual(len(events), 1)
        events = Event.objects.filter_by_action(action4)
        self.assertEqual(events[0], event2)
        self.assertEqual(len(events), 1)
    def test_person_with_different_distinct_id(self):