Creating journal entry on custom object item leaves Created By blank

### Plugin Version

0.4.1

### NetBox Version

4.4.6

### Python Version

3.12

### Steps to Reproduce

1. Create custom object type
2. Create item under custom object
3. Create a journal entry for that item

### Expected Behavior

Created By is correctly populated with user.

### Observed Behavior

Journal entry Created By is blank.