Fix build issue

Author: Jack251970

Flow.Launcher/MainWindow.xaml.cs

@@ -16,6 +16,7 @@
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.Core.Plugin;
 using Flow.Launcher.Core.Resource;
+using Flow.Launcher.Helper;
 using Flow.Launcher.Infrastructure;
 using Flow.Launcher.Infrastructure.Hotkey;
 using Flow.Launcher.Infrastructure.Image;