Partially revert ebcd5711 to fix runner pages

As described in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18738 there is a problem and the larger fix may take longer so we can just revert this small change for now

app/views/admin/runners/_runner.html.haml

@@ -33,7 +33,7 @@
         = tag
   %td
     - if runner.contacted_at
-      = time_ago_with_tooltip runner.contacted_at
+      #{time_ago_in_words(runner.contacted_at)} ago
     - else
       Never
   %td.admin-runner-btn-group-cell

app/views/projects/runners/show.html.haml

@@ -62,6 +62,6 @@
       %td Last contact
       %td
         - if @runner.contacted_at
-          = time_ago_with_tooltip @runner.contacted_at
+          #{time_ago_in_words(@runner.contacted_at)} ago
         - else
           Never