Fixes observers being able to open vore eggs

Being a nosy ghost is even worse when the egg gets noisily smashed open from ghost interaction.

code/game/objects/items/weapons/storage/egg_vr.dm

@@ -17,6 +17,8 @@
 	use_sound = 'sound/items/drop/flesh.ogg'
 
 /obj/item/weapon/storage/vore_egg/open(mob/user as mob)
+	if(isobserver(usr))
+		return
 	icon = open_egg_icon
 	..()