Reset the start date selection in calendar range picker when clicking on a unavailable day
What I expected
To select an earlier start date than the one I chose by mistake.
What happened instead
All the dates before the original start date are greyed out, and I'm not able to click on them until I choose an end date first.
Steps to reproduce the issue
1. Create a product with customer defined blocks of one day and Calendar Range Picker enabled
2. Choose a start date
3. Try to choose an earlier start date instead.