azdev: use the localhost redirect URI for VS's client ID

Use the localhost redirect URI specified in the VS AAD application
configuration. The localhost option allows us to use the system web
view, whereas 'urn:ieft:wg:oauth:2.0:oob' does not.

src/shared/Microsoft.AzureRepos/AzureDevOpsConstants.cs

@@ -13,9 +13,8 @@ internal static class AzureDevOpsConstants
         // We share this to be able to consume existing access tokens from the VS caches
         public const string AadClientId = "872cd9fa-d31f-45e0-9eab-6e460a02d1f1";
 
-        // Standard redirect URI for native client 'v1 protocol' applications
-        // https://docs.microsoft.com/en-us/azure/active-directory/develop/v1-protocols-oauth-code#request-an-authorization-code
-        public static readonly Uri AadRedirectUri = new Uri("urn:ietf:wg:oauth:2.0:oob");
+        // Redirect URI specified by the Visual Studio application configuration
+        public static readonly Uri AadRedirectUri = new Uri("http://localhost");
 
         public const string VstsHostSuffix = ".visualstudio.com";
         public const string AzureDevOpsHost = "dev.azure.com";