Branch Plan SSH keys for Stash linked repositories are not updated when the keys are regenerated

Steps to reproduce

1. Create a Stash linked repository in Bamboo
2. Create a plan using the Stash repo
3. Create a plan branch
4. Delete key in Stash user profile
5. Go to linked repository and resave the configuration to regenerate the keys
6. Check the SSH keys used by the master branch and the branch via the database

Expected Behaviour

The branch plan repositories should use the same keys as the master plan

Observed Behaviour

The branch plan keys are still using the outdated keys