Fix incorrect node being checked in segwit recovery test
Discovered while working on backports related to send_txs_and_test.
Before this patch, the test happens to pass because the check at line 270 is looking for a tx not being in the mempool of node0, when it should be checking node1 (see calls to check_for_no_ban_on_rejected_tx on node_std at line 270-273).
Test Plan: test_runner.py abc-segwit-recovery
Reviewers: #bitcoin_abc, deadalnix, markblundeberg
Reviewed By: #bitcoin_abc, markblundeberg
Differential Revision: https://reviews.bitcoinabc.org/D3859