## 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
)
        event2 = Event.objects.create(
            event="$autocapture",
            team=self.team,
            distinct_id="whatever",
            elements=[
                Element(tag_name="a", nth_child=2, nth_of_type=0, order=0, attr_id="someId"),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=1),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=2),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=3),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=4),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=5),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=6),
                
                Element(href="/a-url-2", nth_child=0, nth_of_type=0, order=7),
            ],
        )
        
        team2 = Team.objects.create()
        event3 = Event.objects.create(
            event="$autocapture",
            team=team2,
            distinct_id="whatever",
            elements=[
                Element(tag_name="a", nth_child=2, nth_of_type=0, order=0, attr_id="someId"),
                Element(tag_name="div", nth_child=0, nth_of_type=0, order=1),
            ],
        )
        
        action1 = Action.objects.create(team=self.team, name="action1")