Fix selector in example styles.css

[stephenmk]

The selector without the ul name will work in Firefox, but it does not work in Chromium (and probably Edge, although I didn't test).

[stephenmk]

Likely that the "styles" entry in test/data/database-test-cases.json may need to be updated as well, although it seems all the automated tests passed.

Edit: had to scroll down to see that the CI / Unit Tests (pull_request) step failed. I'll look into it tomorrow.

[stephenmk]

Okay, I had to also add the ul name to the selectors in anki-note-builder-test-results.json and translator-test-results-note-data1.json to get the unit tests to pass.

Just to reiterate, I think this fix is important because this error could mislead people into thinking the element names are not necessary in these CSS selectors. If you load the current version of the valid test dictionary into Yomitan on firefox, you'll see that the text in the entry for ばね is yellow as expected. It does not work on Chromium, at least for me.