Allow transitions to same state in db

We currently have cases where the CFD might transition to a same state twice when restarting.
Furthermore, we might transition from `Open` to `Open` upon renewal.
Since it is currently unclear if this restriction is really needed we just print a warning in the logs instead of failing.

daemon/src/db.rs

@@ -170,7 +170,11 @@ pub async fn insert_new_cfd_state_by_order_id(
     // make sure that the new state is different than the current one to avoid that we save the same
     // state twice
     if mem::discriminant(&latest_cfd_state_in_db) == mem::discriminant(&new_state) {
-        anyhow::bail!("Cannot insert new state {} for cfd with order_id {} because it currently already is in state {}", new_state, order_id, latest_cfd_state_in_db);
+        tracing::warn!(
+            "Same state transition for cfd with order_id {}: {}",
+            order_id,
+            latest_cfd_state_in_db
+        );
     }
 
     let cfd_state = serde_json::to_string(&new_state)?;