AppArmor: update profile from upstream at commit 9d3fa88cdab512e45f6fd80f067337f200d356bc

Copied from
https://gitlab.com/apparmor/apparmor-profiles/blob/master/ubuntu/20.04/usr.bin.thunderbird.
This brings back the support for running Thunderbird as a native Wayland
application, which somehow never made it into the 115 packaging.