p2p: fix gater blocklist setup (#5511) #17118

Job	Run time
filter-changes	6s
quicktests	2m 10s
lint	3m 29s
build (ubuntu-latest)	1m 3s
unittests (ubuntu-latest)	17m 47s
build (self-hosted, linux, arm64)	1m 15s
unittests (self-hosted, linux, arm64)	17m 3s
build (go-spacemesh, m2-pro)	16s
unittests (go-spacemesh, m2-pro)	14m 19s
build (windows-latest)	6m 21s
unittests (windows-latest)	28m 11s
ci-status	3s
	1h 32m 3s

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