we have two copies of the u64_to_bytes() function (used in tests)

[arvidn]

This patch deletes one of them.

[coveralls-official]

Pull Request Test Coverage Report for Build 10263283504

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 304 unchanged lines in 11 files lost coverage.
• Overall coverage increased (+1.8%) to 80.785%

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Files with Coverage Reduction	New Missed Lines	%
crates/chia-protocol/src/classgroup.rs	1	0.0%
crates/chia-bls/src/error.rs	4	0.0%
crates/chia-bls/src/parse_hex.rs	6	70.0%
crates/chia-traits/src/streamable.rs	9	92.54%
crates/chia-bls/src/secret_key.rs	11	88.22%
crates/chia-bls/src/signature.rs	19	93.94%
crates/chia-bls/src/public_key.rs	19	89.9%
wheel/src/api.rs	43	67.02%
crates/chia-bls/src/bls_cache.rs	51	72.13%
crates/chia-bls/src/gtelement.rs	58	11.11%

Totals
Change from base Build 10260340941:	1.8%
Covered Lines:	11364
Relevant Lines:	14067

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💛 - Coveralls