Removes 20 second delay for rootful mode install script on WSL

[linghengqian]

- What I did

• Removes 20 second delay for rootful mode install script on WSL. Microsoft is proposing to use curl https://get.docker.com | sh in the WSL documentation. Adding a 20 second delay to this script seems unreasonable. See https://learn.microsoft.com/en-us/windows/wsl/tutorials/gpu-compute .
• Fixes #412 .

- How I did it

• Not bad?

- How to verify it

• This is essentially a rollback of #170.

- Description for the changelog

• Removes 20 second delay for rootful mode install script on WSL.

- A picture of a cute animal (not mandatory but encouraged)

• It doesn't seem necessary.