Fix various template warnings (#32)

- Missing :
- Deprecated =
- Not valid color name
- Must always return statement

data/magic-future-mirrored.mse-style/style

@@ -588,7 +588,7 @@ extra card style:
 		visible: { card.pt != "" }
 		render style: image
 		image: { card_ptbox() }
-	paintbrush
+	paintbrush:
 		left: { if card.pt != "" then 92 else 30 }
 		top : 476
 		width: 40