change(rpc): Update `getblock` RPC to more closely match zcashd #2211

Job	Run time
Check deny.toml bans	41s
Check deny.toml bans --features default-release-binaries	48s
Check Cargo.lock is up to date	51s
Install zebrad from lockfile without cache on ubuntu-latest	8m 31s
Check deny.toml bans --all-features	47s
Check deny.toml sources	45s
Check deny.toml sources --features default-release-binaries	47s
Check for unused dependencies	8s
Test stable on ubuntu-latest	31m 35s
Check deny.toml sources --all-features	44s
Test beta on ubuntu-latest	31m 35s
Test stable on macos-latest	39m 55s
Test stable on windows-latest	1h 1m 32s
Test beta on windows-latest	59m 48s
Open or update issues for OS integration failures	0s
	3h 58m 27s

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