sudo: update multilib patch for sudo.conf

Update multilib patch for sudo.conf that there is one more replacement
of @plugindir@ to avoid installation conflict.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>