Converting a question to SQL/Native keeps the /notebook in the URL

[flamber]

Describe the bug
When converting a question to SQL/Native, then the URL keeps the /notebook in the URL.

To Reproduce

1. Simple question > Sample Dataset > Orders
2. Click Editor-icon in top-right corner (notice /notebook is added to the URL, which is correct)
3. Click "View the SQL" and "Convert this question to SQL" (the /notebook is kept, incorrect)
4. Save question and do a browser refresh, which then does not auto-run the query, since the URL still contains /notebook - manually removing that from the URL makes it work as normal.

Expected behavior
Remove the /notebook when going from Notebook to SQL/Native editor.

Information about your Metabase Installation:
Metabase 0.33.0 thru 0.35.4

Additional context
This is not information stored with the question, just a state which causes a strange behavior on browser refresh - and in case people copy+paste the URL to other people.