runner/settings: Deduplicate cleanup

Deduplicate cleanup so it's also easy to parse the line in a different
way.

Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Tested-by: Peter Senna Tschudin <peter.senna@linux.intel.com>
Reviewed-by: Peter Senna Tschudin <peter.senna@linux.intel.com>
Link: https://lore.kernel.org/r/20250207231039.2883195-5-lucas.demarchi@intel.com


Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>