fix: if ending socket with error, destroy it in the end

[twoeths]

Motivation

• There are a lot of sockets retained, see Sockets leak #201
• When ending a socket with error, we clear the timer which make it unable to destroy the socket in the end

**Description

• When ending socket and error happen, keep the timer so that socket is destroyed in the end

[achingbrain]

I think with this change, if the socket is closed with an error, maConn.timeline.close will now not be set.

[wemeetagain]

@tuyennhv we discussed this during js-libp2p triage meeting, @achingbrain is working on an alternative fix. Will close this PR once his PR is open / merged.

[twoeths]

This solution works well so far (it's deployed around Aug 30 12:00), waiting for the new PR by @achingbrain