Fix debug logging interpolation

[tipabu]

Previously, message and args would each get interpolated separately, with a result like

wrote python info of %s at (PosixPath('/usr/bin/python3.12'), PosixPath('/home/...f265.json')) [DEBUG via_disk_folder:153]

Now, interpolate the message (which has its own formatting placeholder) first, then the args; the result is more like

wrote python info of /usr/bin/python3.12 at /home/...f265.json [DEBUG via_disk_folder:153]

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• ran the linter to address style issues (tox -e fix)
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[gaborbernat]

We should use logging formatting and not f-string formatting.