List tables: Account for comments being reused on the post edit screen.

Adding the `.wp-list-table` class gets us a few responsive goodies for free. And now it won't show a strange button outline.

see #32395.


git-svn-id: https://develop.svn.wordpress.org/trunk@33101 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/list-tables.css

@@ -1903,11 +1903,13 @@ div.action-links,
 		overflow: hidden;
 	}
 
-	/* Plugin/Theme Management Page */
+	/* List tables that don't toggle rows */
+	.comments-box .toggle-row,
 	.wp-list-table.plugins .toggle-row {
 		display: none;
 	}
 
+	/* Plugin/Theme Management */
 	#wpbody-content .wp-list-table.plugins td {
 		display: block;
 		width: auto;