Ports color standardization

from tg/52574

code/game/objects/structures/artstuff.dm

@@ -174,11 +174,11 @@
 		var/obj/item/pen/P = I
 		switch(P.colour)
 			if("black")
-				return "#000000"
+				return COLOR_BLACK
 			if("blue")
-				return "#0000ff"
+				return COLOR_BLUE
 			if("red")
-				return "#ff0000"
+				return COLOR_RED
 		return P.colour
 	else if(istype(I, /obj/item/soap) || istype(I, /obj/item/reagent_containers/rag))
 		return canvas_color

code/game/objects/structures/flora.dm

@@ -350,7 +350,7 @@
 	name = "photosynthetic potted plant"
 	desc = "A bioluminescent plant."
 	icon_state = "plant-09"
-	light_color = "#2cb2e8"
+	light_color = COLOR_BRIGHT_BLUE
 	light_range = 3