[Webservice] Fix log file locations in config for serve-overview

Description

In !1074 (merged) I changed where log files are stored, but I forgot that the serve-overview page also refers to these paths. This caused the overview to fail with errors like:

subprocess.CalledProcessError: Command 'tail -5000 monitor.log' returned non-zero exit status

This simply updates the paths.

How Has This Been Tested?

Configuring the new paths for xcaltst in ~/.config/pycalibration/webservice/serve_overview.yaml; the overview page works again.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Reviewers

@schmidtp @ahmedk