Update apparmor profiles for ubntu 14.04

The path names for the apparmor profiles changed between ubuntu 12.04 and 14.04. Updated the corresponding lines for the securedrop-app-code postinst and apparmor profiles.

The securedrop-app-code currentyl only puts the profile in complain mode. This will need to be changed to `aa-enforce` when the apparmor profiles are flushed out.