fix: add missing router registration (backport #1379)

[mergify[bot]]

Description

• Add missing router registration

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• [x] I followed the contributing guidelines and code of conduct.
• [x] I have added a relevant changelog to CHANGELOG.md
• [ ] I have added tests to cover my changes.
• [ ] I have updated the documentation accordingly.
• [ ] I have updated API documentation client/docs/swagger-ui/swagger.yaml

  ---

  This is an automatic backport of pull request #1379 done by Mergify.

[mergify[bot]]

Cherry-pick of e3f3bd76fadab60b45befb14e8fb9f0fff0d1967 has failed:

On branch mergify/bp/release/v0.49.x/pr-1379
Your branch is up to date with 'origin/release/v0.49.x'.

You are currently cherry-picking commit e3f3bd76f.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
    modified:   x/fswap/keeper/keeper.go
    modified:   x/fswap/module.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
    both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally