Don't underline commit status icon on hover (#18372)

- Don't underline the commit status icon, as it isn't a link per-se.

web_src/less/_base.less

@@ -249,7 +249,8 @@ a.label,
 .ui.search .results a,
 .ui .menu a,
 .ui.cards a.card,
-.issue-keyword a {
+.issue-keyword a,
+a.commit-statuses-trigger {
   text-decoration: none !important;
 }