Fixes U4-1368 so the FileHandlerData doesn't handle setting properties for Document and Media.

Properties using the UploadField will have its value as well as related values updated in a BeforeSave event.

src/Umbraco.Core/IO/IFileSystem.cs

@@ -6,7 +6,7 @@ using Umbraco.Core.CodeAnnotations;
 namespace Umbraco.Core.IO
 {
 	[UmbracoExperimentalFeature("http://issues.umbraco.org/issue/U4-1156", "Will be declared public after 4.10")]
-    internal interface IFileSystem
+	internal interface IFileSystem
     {
         IEnumerable<string> GetDirectories(string path);