Display matched selector priority

[toshok]

This is a follow-up to the investigation that led to replayio/devtools#10608 . We can see there that the non-top rule was originally left as the "matching one".

While it shouldn't even be displayed there in the first place (which got fixed by replayio/devtools#10608 ), it wasn't apparent why it got matched. The specificity wasn't higher. It turns out that it was an !important rule but we never surfaced that in the UI.