removed App_data per [Mvc] Remove App_Data from MvcSample.Web Startup (#1716)

samples/MvcSample.Web/Startup.cs

@@ -25,9 +25,9 @@ namespace MvcSample.Web
         {
             app.UseFileServer();
 #if ASPNET50
-            // We use Path.Combine here so that it works on platforms other than Windows as well.
+            // Set up configuration sources.
             var configuration = new Configuration()
-                                        .AddJsonFile(Path.Combine("App_Data", "config.json"))
+                    .AddJsonFile("config.json")
                     .AddEnvironmentVariables();
             string diSystem;