fix(front): Update currentPlan of Plans component so it is not always…

[maidi29]

Description

Since the latest update the currentPlan property of the Plans component was not updated anymore and always null.

Additional context

I access currentPlan, e.g. to know the label of the currently active plan to display it in the selection UI. That's why it needs to be updated once the user gos to another plan.

What is the purpose of this pull request?

• [x] Bug fix
• [ ] New Feature
• [ ] Documentation update
• [ ] Other

Before submitting the PR, please make sure you do the following:

• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Follow the Conventional Commits v1.0.0 standard for PR naming (e.g. feat(examples): add hello-world example).
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [ ] Ideally, include relevant tests that fail without this PR but pass with it.