Use ContextMenu class instead of interface

Author: VictoriousRaptor

Plugins/Flow.Launcher.Plugin.Explorer/Main.cs

@@ -23,7 +23,7 @@ public class Main : ISettingProvider, IAsyncPlugin, IContextMenu, IPluginI18n, I
 
         private SettingsViewModel viewModel;
 
-        private IContextMenu contextMenu;
+        private ContextMenu contextMenu;
 
         private SearchManager searchManager;