Change neutral-state icon for MR widget reports

This commit changes the icon that is used to indicate a
neutral state from a dot do a dash.

app/assets/javascripts/reports/components/issue_status_icon.vue

@@ -27,7 +27,7 @@ export default {
         return 'status_success_borderless';
       }
 
-      return 'status_created_borderless';
+      return 'dash';
     },
     isStatusFailed() {
       return this.status === STATUS_FAILED;