### Preflight Checklist
* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 6.0.0-beta.15
* **Operating System:**
  * Windows 10 64bit
* **Last Known Working Electron version:**
  * 5.0.8

### Expected Behavior
The window restores its size to what it used to be

### Actual Behavior
The window is shown in the smallest size

### To Reproduce
1) Maximize Window
2) Minimize Window
3) Restore Window (click on the icon in the taskbar)
4) Unmaximize Window

### Screenshots
![grafik](https://user-images.githubusercontent.com/10595986/61781949-84f18100-ae05-11e9-8983-17edb536427f.png)


shell/browser/native_window_views_win.cc
case APPCOMMAND_NEW:
      return "new";
    case APPCOMMAND_OPEN:
      return "open";
    case APPCOMMAND_CLOSE:
      return "close";
    case APPCOMMAND_SAVE:
      return "save";
    case APPCOMMAND_PRINT:
      return "print";
    case APPCOMMAND_UNDO:
      return "undo";
    case APPCOMMAND_REDO:
      return "redo";
    case APPCOMMAND_COPY:
      return "copy";
    case APPCOMMAND_CUT:
      return "cut";
    case APPCOMMAND_PASTE:
      return "paste";
    case APPCOMMAND_REPLY_TO_MAIL:
      return "reply-to-mail";
    case APPCOMMAND_FORWARD_MAIL:
      return "forward-mail";
    case APPCOMMAND_SEND_MAIL:
      return "send-mail";
    case APPCOMMAND_SPELL_CHECK:
      return "spell-check";
    case APPCOMMAND_MIC_ON_OFF_TOGGLE:
      return "mic-on-off-toggle";