Fix not working my-reaction filter

What does this MR do?

Fix not working my-reaction filter in GitLab.com

Are there points in the code the reviewer needs to double check?

I don't have a GitLab EE development environment, so I have not tested this.

Why was this MR needed?

New my-reaction filter doesn't work in GitLab.com

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

gitlab-org/gitlab-ce#37835