Minor explicit cleanup before main exits

Author: benbuck

src/Finestray.cpp

@@ -264,6 +264,8 @@ int WINAPI wWinMain(_In_ HINSTANCE hinstance, _In_opt_ HINSTANCE prevHinstance,
     minimizeEventHook.destroy();
     trayIcon_.destroy();
     stop();
+    autoTrayedWindows_.clear();
+    settingsDialogWindow_.destroy();
     appWindow_.destroy();
 
     return 0;