fix: emulator target setTimeout not working

[rosslavery]

On Windows (and possibly other platforms), the setTimeout before calling kill-port is not working as expected.

Problem

• The delay is not adhered to, and the kill-port runs immediately
• An empty file with the name {} is written to disk in the root of the workspace

Solution

• Modify and escape the code passed to node -e to fix the above-mentioned problems

[simondotm]

Thanks for the fix @rosslavery