[net processing] Remove CNodeState ctor body

Summary:
It's a no-op. The ctor for RollingBloomFilter already calls reset().

This concludes backport of core#21424
https://github.com/bitcoin/bitcoin/pull/21424/commits/55966e0cc03f0e380d21a9434b048d4d515b6729

Depends on D13303

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D13304