Applying a template does not update Process.template

https://redmine.teklia.com/issues/7949

1. Create a process.
2. Open the dev tools.
3. Apply a template on this process.
4. The ApplyProcessTemplate API call returns a process with a template_id set to the ID of the template.
5. Refresh the page.
6. The RetrieveProcess API call returns a process with no template_id set.
7. Cry.