Leave IBD in rpc_listtransactions
Leave IBD in rpc_listtransactions

Summary:
The test won't run alone because IBD will prevent the inital
`sync_all()` to sync the mempools.

Test Plan:
  ./test/functional/test_runner.py rpc_listtransactions
Will fail before the diff, but not after.

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: teamcity, schancel

Differential Revision: https://reviews.bitcoinabc.org/D2628

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