Added DataTrigger on generate password button to close flyout

ModernKeePass/Actions/CloseFlyoutAction.cs

@@ -0,0 +1,17 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Microsoft.Xaml.Interactivity;
+
+namespace ModernKeePass.Actions
+{
+    public class CloseFlyoutAction : DependencyObject, IAction
+    {
+        public object Execute(object sender, object parameter)
+        {
+            var flyout = sender as Flyout;
+            flyout?.Hide();
+
+            return null;
+        }
+    }
+}