Knight Lore: Routine at D3A9

D3A9: Take the arch's Z

Used by the routine at check_next_arch. Part of adjust_plyr_Z_for_arch.
adj_plyr_Z	D3A9	LD A,(IY+$03)	legs' Z = the pillar's Z
	D3AC	LD (IX+$03),A
	D3AF	ADD A,$0C	head's Z = 12 higher
	D3B1	LD (IX+$23),A
	D3B4	RET