When `q=source` is rejected, it references `updates` incorrectly
curl -i 'http://localhost:8082/micropub?q=source&url=http://localhost:1313/mf2/2020/10/71fgc/'
HTTP/1.1 400
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY
Content-Type: application/json
Transfer-Encoding: chunked
Date: Thu, 08 Oct 2020 20:18:55 GMT
Connection: close
{"error":"invalid_request","error_description":"URL http://localhost:1313/mf2/2020/10/71fgc/ is not supported for updates"}