Fix regexp for old controlplane path

[turkenh]

Description of your changes

Looks like the current regexp for old control plane path only works if controlplane is named as ctp. This PR fixes the regexp for old controlplane path.

I have:

• [x] Read and followed Upbound's contribution process.
• [x] Run make reviewable to ensure this PR is ready for review.
• [x] Added backport release-x.y labels to auto-backport this PR, as appropriate.

How has this code been tested

Unit tests

[github-actions[bot]]

Successfully created backport PR #450 for release-0.26.