Ensure that new copies of NVDA and NVDA slave (that will show a GUI) arn't told to hide their first window, when executed with shellExecute. Fixes #4475
Specifically this is core.restart, launching NVDA after installation, and launching the launcher after an update is downloaded.
This was always an error, but some how NVDA with WX 2 seemed to get around it. Not so for WX 3.