## 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
Person.objects.create(distinct_ids=["whatever"], team=self.team)
        action1 = Action.objects.create(team=self.team)
        ActionStep.objects.create(action=action1, href="/a-url", tag_name="a")
        ActionStep.objects.create(action=action1, href="/a-url-2")
        event1 = Event.objects.create(
            team=self.team,
            distinct_id="whatever",
            elements=[Element(tag_name="a", href="/a-url", text="some_text", nth_child=0, nth_of_type=0, order=0,)],
        )
        event2 = Event.objects.create(
            team=self.team,
            distinct_id="whatever2",
            elements=[Element(tag_name="a", href="/a-url", text="some_text", nth_child=0, nth_of_type=0, order=0,)],
        )
        event3 = Event.objects.create(
            team=self.team,
            distinct_id="whatever",
            elements=[
                Element(tag_name="a", href="/a-url-2", text="some_other_text", nth_child=0, nth_of_type=0, order=0,),
                
                Element(tag_name="div", text="some_other_text", nth_child=0, nth_of_type=0, order=1,),
            ],
        )
        event4 = Event.objects.create(