Fix various template warnings (#32)

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

data/magic-new-split-clear.mse-style/style

@@ -597,7 +597,7 @@ extra card style:
 		angle: 90
 		render style: image
 		image: {if styling.overlay == "" then nil else styling.overlay + "/overlay.png"}
-	paintbrush
+	paintbrush:
 		left: 25
 		top: 337
 		width: {if contains(styling.clear_side, match:"left") then 21 else 0}
@@ -607,7 +607,7 @@ extra card style:
 		choice images:
 			black: /magic-future-common.mse-include/paintbrush_black.png
 			white: /magic-future-common.mse-include/paintbrush_white.png
-	paintbrush 2
+	paintbrush 2:
 		left: 277
 		top: 337
 		width: {if contains(styling.clear_side, match:"right") then 21 else 0}