Scoped labels help icon missing

Summary

As you can see in the screenshot the scoped labels help icon is missing in the activity stream. It´s only missing in the activity stream but shown in all the other places.

What it should look like (under windows even this is wronng because the icon is misaligned - see https://gitlab.com/gitlab-org/gitlab-ee/issues/11156#note_173417482):

gitlab-ce~10143086

Relevant logs and/or screenshots

Implementation Notes

• Fix this as the same time as https://gitlab.com/gitlab-org/gitlab-ee/issues/11748