Revert "amnesiac can't turn into default role"

They most certainly can, changing this is a gameplay change and is not
the proper place for this anyway.

This reverts commit 43676344a8.

modules/wolfgame.py

@@ -5348,7 +5348,7 @@ def start(cli, nick, chan, forced = False):
     var.ORIGINAL_ROLES = copy.deepcopy(var.ROLES)  # Make a copy
 
     # Handle amnesiac
-    amnroles = list(var.ROLE_GUIDE.keys() - [var.DEFAULT_ROLE])
+    amnroles = list(var.ROLE_GUIDE.keys())
     for nope in var.AMNESIAC_BLACKLIST:
         amnroles.remove(nope)
     for nope in var.TEMPLATE_RESTRICTIONS.keys():