Event level defaults are not set correctly when you copy an Event

Event level defaults are not set correctly when you copy an Event.

1. Create an Event with Fee Label.
2. Copy this Event.
3. Add a Participant record for Copied Event.

Here Event label is not set correctly. This is because when we set defaults, we retrieve option value based on "label".
In this case since similar label already exists for Original Event, it returns wrong result.

Solution:
While retrieving Fee Level we should consider option group, that corresponds to copied event.