luci-app-ksmbd: fix references to ksmbd.conf

Update the configuration view to refer to the updated `ksmbd.conf`
template file name as well.

Supersedes: #6080
Fixes: f0e0bccf

 ("luci-app-ksmbd: update menu dependencies")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>