Make graves white

Making them easy to distinguish from walls.

doc/fixes36.1

@@ -741,7 +741,7 @@ swallowers can't re-engulf hero immediately after spitting him/her out
 werejackals can summon foxes and coyotes; werewolves can summon wargs
 allow taming monkeys and apes with bananas
 GENERICUSERS is now a sysconf statement instead of compile-time option
-fountains are bright blue
+fountains are bright blue, graves are white
 ray bounceback chance depends on the wall type
 undead #turning takes less time at higher experience level
 peacefuls may react when you attack other peacefuls

src/drawing.c

@@ -166,7 +166,7 @@ const struct symdef defsyms[MAXPCHARS] = {
        { '<', "ladder up", C(CLR_BROWN) },           /* upladder */
        { '>', "ladder down", C(CLR_BROWN) },         /* dnladder */
        { '_', "altar", C(CLR_GRAY) },                /* altar */
-       { '|', "grave", C(CLR_GRAY) },                /* grave */
+       { '|', "grave", C(CLR_WHITE) },               /* grave */
        { '\\', "opulent throne", C(HI_GOLD) },       /* throne */
 /*30*/ { '#', "sink", C(CLR_GRAY) },                 /* sink */
        { '{', "fountain", C(CLR_BRIGHT_BLUE) },      /* fountain */