Remove clones from block seal function (#7917)

Shouldn't matter much, but this is run on every produced block so free
performance

cumulus/client/consensus/aura/src/collator.rs

@@ -398,7 +398,7 @@ where
 			aura_internal::seal::<_, P>(&pre_hash, &author_pub, keystore).map_err(Box::new)?;
 		let mut block_import_params = BlockImportParams::new(BlockOrigin::Own, pre_header);
 		block_import_params.post_digests.push(seal_digest);
-		block_import_params.body = Some(body.clone());
+		block_import_params.body = Some(body);
 		block_import_params.state_action =
 			StateAction::ApplyChanges(sc_consensus::StorageChanges::Changes(storage_changes));
 		block_import_params.fork_choice = Some(ForkChoiceStrategy::LongestChain);

substrate/client/consensus/aura/src/standalone.rs

@@ -141,7 +141,7 @@ where
 		})?;
 
 	let signature = signature
-		.clone()
+		.as_slice()
 		.try_into()
 		.map_err(|_| ConsensusError::InvalidSignature(signature, public.to_raw_vec()))?;