eating gold in front of the vault guard (trunk only)

<email deleted> wrote:
> Eating gold in a vault (or polymorphing a pile of gold into 1 gold piece)
> doesn't anger the guard.

This addresses the eating part of that report, but the hero
has to get caught doing it.

src/eat.c

@@ -1900,6 +1900,7 @@ eatspecial() /* called after eating non-food */
 #endif
 		else
 		    useupf(otmp, otmp->quan);
+		vault_gd_watching(GD_EATGOLD);
 		return;
 	}
 #ifdef MAIL