[skip ci] Update .warning to .table-warning

app/views/notify/pipeline_failed_email.html.haml

@@ -114,7 +114,7 @@
     = failed.size
     failed
     #{'build'.pluralize(failed.size)}.
-%tr.warning
+%tr.table-warning
   %td{ style: "font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;border:1px solid #ededed;border-bottom:0;border-radius:3px 3px 0 0;overflow:hidden;background-color:#fdf4f6;color:#d22852;font-size:14px;line-height:1.4;text-align:center;padding:8px 15px;" }
     Logs may contain sensitive data. Please consider before forwarding this email.
 %tr.section