rpcdaemon: fix clang tidy after PR 2136 (#2140)

Author: canepat

silkworm/rpc/core/blocks.hpp

@@ -39,8 +39,6 @@ Task<bool> is_latest_block_number(BlockNum block_number, db::kv::api::Transactio
 
 Task<BlockNum> get_block_number_by_tag(const std::string& block_id, db::kv::api::Transaction& tx);
 
-Task<BlockNum> get_block_number_by_tag(const std::string& block_id, db::kv::api::Transaction& tx);
-
 Task<std::pair<BlockNum, bool>> get_block_number(const std::string& block_id, db::kv::api::Transaction& tx, bool latest_required);
 
 Task<BlockNum> get_block_number(const std::string& block_id, db::kv::api::Transaction& tx);