suggestion to don't clone `self` in `get_block` #2199

Job	Run time
Check Cargo.lock is up to date	53s
Install zebrad from lockfile without cache on ubuntu-latest	8m 33s
Test stable on ubuntu-latest	32m 13s
Test beta on ubuntu-latest	31m 33s
Check for unused dependencies	12s
Check deny.toml bans	43s
Test stable on macos-latest	35m 28s
Check deny.toml bans --features default-release-binaries	49s
Test stable on windows-latest	1h 1m 35s
Check deny.toml bans --all-features	47s
Test beta on windows-latest	1h 1m 51s
Check deny.toml sources	44s
Check deny.toml sources --features default-release-binaries	45s
Check deny.toml sources --all-features	46s
Open or update issues for OS integration failures	0s
	3h 56m 52s

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