beacon config: fix URL parsing of filename on windows
When loading a config file on windows (e.g. file://c:\\path\to\file.yml
or c:\\path\to\file.yml
) the URL parsing fails
https://gitlab.esrf.fr/workflow/ewoks/ewoksjob/-/jobs/427072
After this MR: https://gitlab.esrf.fr/workflow/ewoks/ewoksjob/-/jobs/427727
Edited by Wout De Nolf