* [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:**
  * all (according to docs), tested in 2.0.18 & 4.1.3
* **Operating System:**
  *  Windows

### Expected Behavior
To be able to set the working directory for applications started from the windows jump list

### Actual Behavior
It defaults to c:\windows\system32

### To Reproduce
Not really anything to do to reproduce, just look at the documentation, the parameter isn't there:
https://electronjs.org/docs/api/structures/task
https://electronjs.org/docs/api/structures/jump-list-item

### Additional Information
I'm not entirely sure you will agree that this is a bug but afaict the api seems to replicate what the underlying windows api provides so I assume it's an oversight that this parameter in particular is missing - especially considering how problematic it can be for applications to have c:\windows\system32 as their cwd.
atom/browser/browser_win.cc
if (!args->GetNext(exe) && !GetProcessExecPath(exe)) {
    return false;
  }
  
  std::vector<base::string16> launch_args;
  if (args->GetNext(&launch_args) && !launch_args.empty())
    *exe = base::StringPrintf(L"\"%ls\" %ls \"%%1\"", exe->c_str(),
                              base::JoinString(launch_args, L" ").c_str());
  else
    *exe = base::StringPrintf(L"\"%ls\" \"%%1\"", exe->c_str());
  return true;
}
bool FormatCommandLineString(base::string16* exe,
                             const std::vector<base::string16>& launch_args) {
  if (exe->empty() && !GetProcessExecPath(exe)) {
    return false;
  }
  if (!launch_args.empty()) {
    *exe = base::StringPrintf(L"%ls %ls", exe->c_str(),
                              base::JoinString(launch_args, L" ").c_str());
  }
  return true;
}
}  
Browser::UserTask::UserTask() = default;