Fix ListEditView JS tests.
Review Request #12815 — Created Jan. 27, 2023 and submitted
The JS tests for the ListEditView had a couple bugs. First was that we
had a mix of string characters, with both backtick strings and
single-quote strings that were concatenated. This meant that the
<input>element had some garbage characters in it with extra
quotes and + signs.
Second was that the default row HTML we were creating was only being passed
to the template, and not also to the view.
Ran js-tests and saw all djblets tests pass.