Fewer decal icon states, shower curtains.

Someone had added shower curtains to the map. Creates proper definitions to avoid colors being lost on cleaning.
Floor corner decals now all utilize a white base state and simply apply a color.

code/game/objects/structures/curtains.dm

@@ -44,6 +44,14 @@
 	color = "#B8F5E3"
 	alpha = 200
 
+/obj/structure/curtain/open/bed
+	name = "bed curtain"
+	color = "#854636"
+
+/obj/structure/curtain/open/privacy
+	name = "privacy curtain"
+	color = "#B8F5E3"
+
 /obj/structure/curtain/open/shower
 	name = "shower curtain"
 	color = "#ACD1E9"