Remove syndicate hat and variants from trinket pool

[Lady Birb]

The syndicate hat is supposed to be a challenge, a sign that you think you can take on the entire station, and as such players are expected to kill you for the hat the moment they see you. Unfortunately, some chucklefuck added it to the hat trinket pool, so now nine times out of ten if someone sees a syndicate hat wearer they don't attack, just in case the person got it from a trinket. This is an obvious problem and should be fixed immediately. Remove the hat from the trinket pool, so we can always be sure someone wearing it got it on purpose.