remove stray print

Author: lmondada

hugr-core/src/hugr/persistent.rs

@@ -306,9 +306,6 @@ impl PersistentHugr {
             };
             let repl = repl.map_host_nodes(|n| node_map[&n]);
 
-            println!("applying replacement for commit : {:?}", commit_id);
-            println!("{}", hugr.mermaid_string());
-            dbg!(&node_map);
             let simple_replace::Outcome {
                 node_map: new_node_map,
                 ..