[v2] Run Task does nothing

- `code-server` version: v2, preview 4
- Host OS Version: Debian 10 Buster (running on ChromeOS via Crouton)
- Client OS Version: ChromeOS 75

## Description
Run Task doesn't do anything

## Steps to Reproduce
1. Run a task (F1>Run Task)
2. Terminal pops up with:
`> Executing task: make`
3. Nothing else happens, htop doesn't show any process as executed