Logs - Add missing formatting

[luka5]

Follow up to #2320

Right now the logs look like:

INFO    -watch-namespace is %q. Only HorizontalRunnerAutoscalers in %q are watched, cached, and considered as scale targets.    {"my-namespace": "my-namespace"}

But I expect it to look like:

INFO    -watch-namespace is "my-namespace". Only HorizontalRunnerAutoscalers in "my-namespace" are watched, cached, and considered as scale targets.

[mumoshu]

LGTM. Thank you for your contribution @luka5!