When TRAMP archives are enabled, back out of the archive before trying to find
the project root. Starting inside the archive makes opening archives quite slow.

Replace this placeholder text with a summary of the changes in your PR.
The more detailed you are, the better.

• The commits are consistent with our contribution guidelines
• You've added tests (if possible) to cover your change(s)
  • Would require gvfs, as far as I know.
• All tests are passing (make test)
  • Don't pass locally, with or without this change.
• The new code is not generating bytecode or M-x checkdoc warnings
• You've updated the changelog (if adding/changing user-visible functionality)