test: fix another intermittent fault in p2p_leak

Summary: Missed in D18043. This peer gets disconnect because it sends a non-verack message right after sending a version. P2PInterface.wait_until checks for the connection by default for some reason, in addition to checking for whatever we tell it to check. Opt-out of this check.

Test Plan: ninja check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18051