Fix overlay restart

Dotnet/Overlay/Electron/VRCXVRElectron.cs

@@ -111,6 +111,7 @@ namespace VRCX
             Exit();
             Instance = new VRCXVRElectron();
             Instance.Init();
+            Program.VRCXVRInstance = Instance;
             //MainForm.Instance.Browser.ExecuteScriptAsync("console.log('VRCXVR Restarted');");
         }