Bump tool_wallet timeout
Summary:
This bumps the timeout to match Core since it appears to be flaky on CI: https://build.bitcoinabc.org/project.html?projectId=BitcoinABC_ResourceIntensiveBuilds&testNameId=7256257418448933135&tab=testDetails
Partial backport of Core PR16888 (most of it is already backported, minus the tests we do not have yet)
Test Plan:
I can't reproduce the flakiness on my machine, but regardless I ran this a few times:
test_runner.py tool_wallet
Reviewers: #bitcoin_abc, nakihito
Reviewed By: nakihito
Differential Revision: https://reviews.bitcoinabc.org/D5865