fix: added empty line.

Author: nakul1010

crates/btc-relay/src/tests.rs

@@ -425,6 +425,7 @@ mod store_block_header_tests {
     fn store_block_header_fork_of_fork_succeeds() {
         run_test(|| {
             BTCRelay::verify_block_header.mock_safe(|_, _, _| MockResult::Return(Ok(())));
+
             let mut genesis = sample_block_header();
             genesis.update_hash().unwrap();