Rewrite fluent lint check.

OpenRA.Mods.Common/Commands/HelpCommand.cs

@@ -17,6 +17,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Commands
 {
 	[TraitLocation(SystemActors.World)]
+	[IncludeStaticFluentReferences(typeof(HelpCommand))]
 	[Desc("Shows a list of available commands in the chatbox. Attach this to the world actor.")]
 	public class HelpCommandInfo : TraitInfo<HelpCommand> { }