Fix events registration update form
Closes #408 (closed)
Before:
- Open event page
- Register for event
- Enter information in the information fields
- Save
- Open the same event page
- Click update registration
- Notice that the fields are empty
After:
- Open event page
- Register for event
- Enter information in the information fields
- Save
- Open the same event page
- Click update registration
- Notice that the fields are not empty