feat(profile): replace former regex by the new @{user} variable.

apparmor.d/groups/virt/cockpit-session

@@ -36,7 +36,7 @@ profile cockpit-session @{exec_path} flags=(attach_disconnected) {
   /etc/motd.d/ r,
   /etc/shells r,
 
-  @{run}/faillock/[a-zA-z0-9]* rwk,
+  @{run}/faillock/@{user} rwk,
   @{run}/systemd/sessions/*.ref rw,
   @{run}/utmp rwk,
   @{run}/motd.d/{,*} r,