Swap 0 with PlayerAnnounceResult.None

In 44034c7649 I added a magic 0 instead of
a call to an enum because I was looking at an outdated diff that didn't
have `None` as an option. Turns out this was added a day later in a
commit I didn't see originally. Changed to `None` to make code better
documentation wise.

TShockAPI/TShock.cs

@@ -254,7 +254,7 @@ namespace TShockAPI
 			OTAPI.Hooks.NetMessage.PlayerAnnounce += (sender, args) =>
 			{
 				//TShock handles this
-				args.Result = 0;
+				args.Result = OTAPI.Hooks.NetMessage.PlayerAnnounceResult.None;
 			};
 			// if sqlite.interop cannot be found, try and search the runtimes folder. this usually happens when debugging tsapi
 			// since it does not have the dependency installed directly