package/polkit: fix file permissions to match upstream

The permissions are now in sync with meson_post_install.py,
and debian.

Most importantly, polkit-agent-helper-1 is now setuid root,
but also the rules.d directories rather than their parents
are owned by polkitd.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>