UltraRogue: fix a segfault related to restoring monsters. The functions for restoring saved games failed to properly correct the t_chasee pointer of monsters chasing the player. Such monsters would attempt to chase NULL instead, with predictable results.

/*
 * Super-Rogue
 * Copyright (C) 1984 Robert D. Kindelberger
 * All rights reserved.
 *
 * See the file LICENSE.TXT for full copyright and licensing information.
 */

#include	<sgtty.h>
typedef	struct sgttyb	SGTTY;
static SGTTY _tty, _res_flg;