Use tags to determine file permissions instead of groups

[Ktrod]

99-picotool.rules uses the plugdev group which Arch doesn't ship with by default.

This change removes the plugdev group in favor of adding the uaccess tag and changes the priority from 99 to 71.

Since this is built into systemd by default it's distro-agnostic

[will-v-pi]

We opted to use #99 in lieu of this, which adds uaccess without removing plugdev, and leaves the priority at 99