Grass Shell seems to be broken on Windows

[pmav99]

Describe the bug

After opening a GRASS mapset, clicking on the GRASS Shell does nothing. There is no warning and there is no traceback. Still the shell window does not open.

How to Reproduce

1. Create a new VM with windows 10 (Ι also tested this on windows server 2016)
2. Install QGIS. I've tried:
   • QGIS 3.4.8
   • QGIS 3.6.3
   • If memory serves I also tried this on 3.7 (master) but I don't have access to that VM now, so ignore this for now.
3. Activate the GRASS plugin from the plugins menu.
4. Open a GRASS mapset. I used the alaska demo dataset.
5. Click on the GRASS Shell button.

expected result: A shell should open.

QGIS and OS versions

https://i.imgur.com/Xn54NwX.png

Any feedback, would be appreciated.

[alexbruy]

Duplicates #28414