Removed groups still visible in Groups -> Frequently Visited

Summary

Removed groups still visible in Groups -> Frequently Visited

Steps to reproduce

• Use a group so that it shows up in the menu Groups -> Frequently Visisted
• Remove the group

What is the current bug behavior?

The removed group is still in the Frequently Visited list.

What is the expected correct behavior?

The removed group should have been removed from the menu.

Results of GitLab environment info

11.2.3 (gitlab-ce@06cbee3bf9dd960380390c0a5df9b67a52a85ba9)