fix misplaced +1

fixes aa7ea5eed5d9e9219a6f1159be0a43d288fd7871
riders, Rodney, Cthulhu may have " of reflection

every player have it before castle - so maybe big bosses should have at
least small chance for it?
Vlad the Impaler may have additional equipment

Due to specified equipment he was missing chance for potion of vampire
blood (case S_VAMPIRE: from makemon.c), he gets amulet of reflection as
continuation of c65805644a869c099360717f502c6d73c5830f18