[lib][native][web] Replace ashoatKeyserverID in Socket code with keyserverID

Summary:
This should be a no-op, since KeyserverConnectionHandler currently only renders a Socket when keyserverID === ashoatKeyserverID.

Depends on D11012

Test Plan:

1. Flow
2. Careful inspection of the code

Reviewers: inka, tomek

Reviewed By: inka

Differential Revision: https://phab.comm.dev/D11013