cpupower: Fix a bug where the -t option of the set subcommand was not working.

The set subcommand's -t option is documented as being available for boost
configuration, but it was not actually functioning due to a bug
in the option handling.

Link: https://lore.kernel.org/r/20250522061122.2149188-2-fj5851bi@fujitsu.com


Signed-off-by: Shinji Nomoto <fj5851bi@fujitsu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>