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ai: bound check setblk to avoid out of bounds with path map

--- a/ai.c

+++ b/ai.c

@@ -46,6 +46,10 @@

 	x = mo->o->w * (Tlwidth / Tlsubwidth);

 	y = mo->o->h * (Tlheight / Tlsubheight);

 	lo = mo->blk;

+	if(mo->x + x > pathwidth)

+		x = pathwidth - mo->x;

+	if(mo->y + y > pathheight)

+		y = pathheight - mo->y;

 	while(y-- > 0){

 		for(e=pp+x; pp<e; pp++)

 			if(clr){