Fix key store config binding

This was missed in dotnet#3033.

src/Aspire.Dashboard/Model/DashboardClient.cs

@@ -173,7 +173,7 @@ X509CertificateCollection GetKeyStoreCertificate()
 
                 using var store = new X509Store(storeName: StoreName.My, storeLocation: StoreLocation.CurrentUser);
 
-                configuration.Bind("ResourceServiceClient:ClientCertificate:KeyStore");
+                configuration.Bind("ResourceServiceClient:ClientCertificate:KeyStore", store);
 
                 store.Open(OpenFlags.ReadOnly);