Schedule block preview does not update in Edit mode when using Full list.

Steps:
1. Create new LP.
2. Add Schedule block.
3. Add content item.
4. Change airtime to future.
5. Publish.
6. Verify preview changes in View mode using Full list. [OK]
7. Switch to Edit mode.
8. Verify preview changes using Full list. [NOK]

Remarks: This bug was not visible on Jenkins because of EZS-869.
Turns out it's essential to change the day, not only the hour and minutes.