pyln-testing: fix catching of memleak/broken errors at exit. #7573
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Commit 901342b ("pyln-testing: require explicit pattern for BROKEN messages.") changed to a manual scan of logs rather than using is_in_log, so it needs to manually refresh, otherwise we miss final log messages.
This causes us to often miss memleak messages, which are printed only in the exit path!
Reported-by: Lagrang3
Fixes: #7565