Fix key store config binding (dotnet#3139)

This was missed in dotnet#3033.

src/Aspire.Dashboard/Model/DashboardClient.cs

@@ -171,9 +171,11 @@ X509CertificateCollection GetKeyStoreCertificate()
                     throw new InvalidOperationException("ResourceServiceClient:ClientCertificate:Source is \"KeyStore\", but no Certificate:FilePath is configured.");
                 }
 
-                using var store = new X509Store(storeName: StoreName.My, storeLocation: StoreLocation.CurrentUser);
+                var storeProperties = new KeyStoreProperties { Name = "My", Location = StoreLocation.CurrentUser };
 
-                configuration.Bind("ResourceServiceClient:ClientCertificate:KeyStore");
+                configuration.Bind("ResourceServiceClient:ClientCertificate:KeyStore", storeProperties);
+
+                using var store = new X509Store(storeName: storeProperties.Name, storeLocation: storeProperties.Location);
 
                 store.Open(OpenFlags.ReadOnly);
 
@@ -189,6 +191,12 @@ X509CertificateCollection GetKeyStoreCertificate()
         }
     }
 
+    internal sealed class KeyStoreProperties
+    {
+        public required string Name { get; set; }
+        public required StoreLocation Location { get; set; }
+    }
+
     // For testing purposes
     internal int OutgoingResourceSubscriberCount => _outgoingChannels.Count;