Nullify IFileDownloader

src/Tgstation.Server.Host/IO/IFileDownloader.cs

@@ -1,7 +1,5 @@
 using System;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.IO
 {
 	/// <summary>
@@ -15,6 +13,6 @@ namespace Tgstation.Server.Host.IO
 		/// <param name="url">The URL to download.</param>
 		/// <param name="bearerToken">Optional <see cref="string"/> to use as the "Bearer" value in the optional "Authorization" header for the request.</param>
 		/// <returns>A new <see cref="IFileStreamProvider"/> for the downloaded file.</returns>
-		IFileStreamProvider DownloadFile(Uri url, string bearerToken);
+		IFileStreamProvider DownloadFile(Uri url, string? bearerToken);
 	}
 }