http: remove default 'drain' listener on upgrade

Ensure that the default `'drain'` listener is removed before the
`'connect'` or `'upgrade'` event is emitted.

PR-URL: https://github.com/nodejs/node/pull/18866


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>