Make is_user_stasised return a truthy value if the user is not found

This ensures that code paths that should not be run if the user is stasised are not run if we don't know the user's status. Generally we don't know the user's status because they are not in the main channel, and therefore allowing them to effectively bypass stasis by not being around is a bad thing. We return -1 to differentiate between actual stasis, and because -1 is still True when cast to boolean. This may have the effect of giving some very odd-looking error messages but that's a very minor issue.

src/wolfgame.py

@@ -7797,7 +7797,7 @@ def is_user_stasised(nick):
         host = var.USERS[nick]["host"]
         acc = var.USERS[nick]["account"]
     else:
-        return 0
+        return -1
     amount = 0
     if not var.DISABLE_ACCOUNTS and acc and acc != "*":
         if acc in var.STASISED_ACCS: