Author label in query URL is not parsed properly

[lauren-ciha]

To repro:

• Go to 'Saved GitHub queries' > 'Add a query'
• Enter https://github.com/microsoft/devhome/pulls/lauren-ciha
• Activate 'Save' button
• Navigate to the newly added query

Expected:

• An empty list/"No items found"
• Search string would be "repo:microsoft/devhome is:open is:issue author:lauren-ciha" (each filter can be in any order)

Actual:

• The open PRs for the Dev Home repo (four at the writing of this issue)
• Verify that the search string doesn't include "author:lauren-ciha"