Fix a reversed bool flag in the getpeerinfo RPC

Summary: This is a rebase bug introduced in D10862. The functional test has been extended to cover the fields that were missing due to this error.

Test Plan:

./test/functional/test_runner.py rpc_net

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D10898