Remove unused import in functional_test_utils

Author: TheBlueMatt

lightning/src/ln/functional_test_utils.rs

@@ -30,7 +30,6 @@ use crate::util::config::UserConfig;
 use crate::util::ser::{ReadableArgs, Writeable};
 
 use bitcoin::blockdata::block::{Block, BlockHeader};
-use bitcoin::blockdata::constants::genesis_block;
 use bitcoin::blockdata::transaction::{Transaction, TxOut};
 use bitcoin::network::constants::Network;