In "Comments" admin view, <li>s within comments are formatted strangely

[markjaquith]

In the "Comments" admin view, <li> items within comments are formatted strangely, with a bottom border (because each comment is itself a <li>)

Should be a simple fix: just define an appropriate li li CSS rule.

[jhodgdon]

Patch to CSS to fix formatting

[markjaquith]

(In [4950]) Format <li> elements properly within wp-admin comment view. Props jhodgdon. fixes #3871