fix: incorrect implementation of filterNodesByGroups

[hperl]

Merging this will fix E2E failures on Kratos master.

Related Issue or Design Document

Checklist

• [ ] I have read the contributing guidelines and signed the CLA.
• [ ] I have referenced an issue containing the design document if my change introduces a new feature.
• [ ] I have read the security policy.
• [ ] I confirm that this pull request does not address a security vulnerability. If this pull request addresses a security vulnerability, I confirm that I got approval (please contact security@ory.sh) from the maintainers to push the changes.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have added the necessary documentation within the code base (if appropriate).

Further comments

[hperl]

Add a test?

The kratos-selfservice-ui-node repo "traditionally" has no tests:

https://github.com/ory/kratos-selfservice-ui-node/blob/541f3bf14a31db4a3fd2f1f10c5d9ab6009c9f9a/package.json#L24

This leads to situations where changes in this repo can break Kratos E2E tests on Kratos master (where the code in this repo is thoroughly tested).

To fix this, I suggest moving this repo into a ui folder in the Kratos repo and have the E2E tests depend on the code in that location. If necessary (I think because the docs reference this repo) we can export the changes with Copybara.

WDYT?