Update to latest `UseRequestLocalization()` signature

- build break

nit: add more trailing commas in init syntax

samples/InlineConstraintSample.Web/Startup.cs

@@ -40,9 +40,12 @@ namespace InlineConstraintSample.Web
         public void Configure(IApplicationBuilder app)
         {
             // Ignore ambient and client locale. Use same values as ReplaceCultureAttribute / CultureReplacerMiddleware.
-            var localizationOptions = new RequestLocalizationOptions();
+            var localizationOptions = new RequestLocalizationOptions
+            {
+                DefaultRequestCulture = new RequestCulture("en-GB", "en-US"),
+            };
             localizationOptions.RequestCultureProviders.Clear();
-            app.UseRequestLocalization(localizationOptions, new RequestCulture("en-GB", "en-US"));
+            app.UseRequestLocalization(localizationOptions);
 
             app.UseMvc();
         }

samples/LocalizationSample.Web/Startup.cs

@@ -23,18 +23,19 @@ namespace LocalizationSample.Web
         {
             var options = new RequestLocalizationOptions
             {
+                DefaultRequestCulture = new RequestCulture("en-US"),
                 SupportedCultures = new List<CultureInfo>
                 {
                     new CultureInfo("fr"),
-                    new CultureInfo("en-GB")
+                    new CultureInfo("en-GB"),
                 },
                 SupportedUICultures = new List<CultureInfo>
                 {
                     new CultureInfo("fr"),
-                    new CultureInfo("en-GB")
+                    new CultureInfo("en-GB"),
-                }
+                },
             };
-            app.UseRequestLocalization(options, new RequestCulture("en-US"));
+            app.UseRequestLocalization(options);
 
             app.UseMvcWithDefaultRoute();
         }

test/WebSites/RazorWebSite/Startup.cs

@@ -44,20 +44,21 @@ namespace RazorWebSite
         {
             var options = new RequestLocalizationOptions
             {
+                DefaultRequestCulture = new RequestCulture("en-GB", "en-US"),
                 SupportedCultures = new List<CultureInfo>
                 {
                     new CultureInfo("fr"),
                     new CultureInfo("en-GB"),
-                    new CultureInfo("en-US")
+                    new CultureInfo("en-US"),
                 },
                 SupportedUICultures = new List<CultureInfo>
                 {
                     new CultureInfo("fr"),
                     new CultureInfo("en-GB"),
-                    new CultureInfo("en-US")
+                    new CultureInfo("en-US"),
-                }
+                },
             };
-            app.UseRequestLocalization(options, new RequestCulture("en-GB", "en-US"));
+            app.UseRequestLocalization(options);
 
             app.UseMvcWithDefaultRoute();
         }