increased checkbox and filter button padding

## What does this MR do?

fixed misalignments as described in https://gitlab.com/gitlab-org/gitlab-ce/issues/19110

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

Not that I know of

## Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/issues/19110

## Screenshots (if relevant)

![image](/uploads/e7c5ffe78e1a5b67fa0335ba1c231df2/image.png)

![image](/uploads/1591ed872e765da3b5ed071c8872194f/image.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


## What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/19110

See merge request !6206