UBUNTU: SAUCE: apparmor: drop prefixing abs root labels with '='

UBUNTU: SAUCE: apparmor: drop prefixing abs root labels with '='

This prefix was not ever meant to go to the logs, and is just a debug
hint. Unfortunately it is showing up in the logs resulting in a double
'=' eg.

  subj==firefox

which has the potential to break some log parsing tools.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>