refactor: Use Mutex type for some mutexes in CNode class

Summary:
No need the RecursiveMutex type for the CNode::cs_vSend, CNode::cs_hSocket and CNode::cs_vRecv.

This is a backport of core#19915

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D9450