White the Joke Shop canopy signature band to match the reference

src/test/tests/test_world.gd

@@ -62,6 +62,10 @@ func test_joke_shop_uses_the_real_sunset_strip_layout() -> bool:
 	builder.build()
 	var a := TestUtils.check(root.find_child("SignatureCanopy", true, false) != null,
 		"the signature-covered canopy is built")
+	var sig_label := root.find_child("CanopySignatures_west", true, false) as Label3D
+	var a2 := TestUtils.check(sig_label != null
+		and sig_label.modulate.r > 0.85 and sig_label.modulate.g > 0.85,
+		"the canopy signature band is white, matching the reference's white celebrity names")
 	var sign := root.find_child("ComedySignLabel", true, false) as Label3D
 	var b := TestUtils.check(sign != null and sign.text.contains("JOKE")
 		and sign.text.contains("SHOP"), "the circular blade sign carries the club wordmark")
@@ -90,7 +94,7 @@ func test_joke_shop_uses_the_real_sunset_strip_layout() -> bool:
 		and WorldBuilder.placement_problems(placements).is_empty(),
 		"the Joke Shop prop placements stay on the sidewalk and clear the lane")
 	root.free()
-	return a and b and c and d and e and f and g and g2 and h
+	return a and a2 and b and c and d and e and f and g and g2 and h
 
 func test_joke_shop_geometry_stays_inside_the_map_budget() -> bool:
 	var root := Node3D.new()