message: Remove unnecessary `GossiperItem` impl for `TrieOrChunk`
diff: @@ -130,14 +130,6 @@ impl FetcherItem for TrieOrChunk {
  }
  }
  -impl GossiperItem for TrieOrChunk {
  - const ID_IS_COMPLETE_ITEM: bool = false;
  -
  - fn target(&self) -> GossipTarget {
  - GossipTarget::All
  - }
  -}
  -
  impl Item for BlockHeader {
  type Id = BlockHash;
  const TAG: Tag = Tag::BlockHeaderByHash;
  