BlockId removal: refactor: Backend::body (#12587)

It changes the arguments of `Backend::body` method from: `BlockId<Block>` to: `&Block::Hash`

This PR is part of BlockId::Number refactoring analysis (paritytech/substrate#11292)

Co-authored-by: parity-processbot <>

substrate/client/network/sync/src/block_request_handler.rs

@@ -364,7 +364,7 @@ where
 				};
 
 			let body = if get_body {
-				match self.client.block_body(&BlockId::Hash(hash))? {
+				match self.client.block_body(&hash)? {
 					Some(mut extrinsics) =>
 						extrinsics.iter_mut().map(|extrinsic| extrinsic.encode()).collect(),
 					None => {