message: fixed some clippy things
diff: @@ -706,7 +706,7 @@ impl ToBytes for Key {
  }
  Key::ChainspecRegistry => result.append(&mut CHAINSPEC_REGISTRY_KEY_BYTES.to_bytes()?),
  Key::ExecutionResultsRootHash { block_height } => {
  - result.append(&mut (block_height.to_le_bytes().iter().copied().collect()))
  + result.append(&mut block_height.to_le_bytes().to_vec())
  }
  }
  Ok(result)
  @@ -988,7 +988,7 @@ mod serde_helpers {
  Key::SystemContractRegistry => BinarySerHelper::SystemContractRegistry,
  Key::ChainspecRegistry => BinarySerHelper::ChainspecRegistry,
  Key::ExecutionResultsRootHash { block_height } => {
  - BinarySerHelper::ExecutionResultsRootHash(&block_height)
  + BinarySerHelper::ExecutionResultsRootHash(block_height)
  }
  }
  }
  