feat(Assassin): only allow guessing enabled roles

[NotSugden]

This PR changes the assassin to only be able to guess roles that are enabled

note: by enabled this means the role is on a 1% chance or higher, not if someone actually has it

simply saves time cycling through roles that aren't even on

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.