fix: Compare versions' back button sometimes returns to invalid URL

[fsbraun]

Description

"Compare versions" offers a back button. This typically returns to the edit or preview endpoint.

When editing a plugin and immediately afterwards clicking "Compare versions..." left the back button returning to an internal URL which only updates the toolbar.

This PR ensures that the correct toolbar request path is kept for the back button.

Related resources

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Checklist

• [x] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.