staging: r8188eu: remove unused argument in on_action_public_default

The function argument action is not used in on_action_public_default.
Remove it.

Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://lore.kernel.org/r/01c8fd82c21ae96773c9099a2cee3c3fd29c1054.1644422181.git.abdun.nihaal@gmail.com


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