staging: rtl8723bs: fix check allowing 5Ghz settings

fix check allowing 5Ghz settings, only disabled and
2.4Ghz enabled states are allowed. Fix comment
accordingly.

Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/df7d0ecc02ac7a27e568768523dd7b3f34acd551.1624367072.git.fabioaiuto83@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>