Fix the Cancel button on the Edit Wiki page.
Created by: DanKnox
The Cancel button on the Edit Wiki page was still redirecting back to the "Index" page which is no longer the default Wiki page.
This commit changes the Cancel button in the following ways:
- Pressing Cancel while editing an existing Wiki page will now redirect you back to the latest version of that page.
- Pressing Cancel while editing a brand new Wiki home page that does not yet exist will redirect you to back to the same Edit Wiki Home page.