Starting second instance does not open workspace parameter

[tsmaeder]

Bug Description:

On Windows, I can open a workspace folder by doing theia.exe <folder path. However, this only works if no Theia window is open yet.

Steps to Reproduce:

1. Make sure Theia is not running
2. Run ~\AppData\Local\Programs\Theia\Theia.exe <path/to/workspace>
3. Observe: A Theia window opens with path/to/workspace open as the workspace folder
4. Run ~\AppData\Local\Programs\Theia\Theia.exe <path/to/another workspace>
5. Observe: A second Theia window opens, but it has not workpace folder open. I would expect the window to open with /path/to/another workspace as the workspace.

Additional Information

• Operating System: 1.53.0
• Theia Version: Windows