test: fix reactor state reset after twisted.trial tests #2251

Job	Run time
python 3.9, bitcoind 28.3 on macos-13	8m 52s
python 3.13, bitcoind 28.3 on macos-13	8m 50s
python 3.9, bitcoind 29.2 on ubuntu-latest	8m 52s
python 3.13, bitcoind 28.3 on ubuntu-latest	8m 52s
python 3.13, bitcoind 29.2 on macos-13	8m 52s
python 3.9, bitcoind 29.2 on macos-13	8m 51s
python 3.9, bitcoind 28.3 on ubuntu-latest	8m 51s
python 3.13, bitcoind 29.2 on ubuntu-latest	8m 35s
	1h 10m 35s

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