Setting "Restrict the days of the week" not working from version 1.1.40

[thisissandip]

What I expected

The setting "Restrict the days of the week" should display the days that can be selected by customer in the backend.

What happened instead

The setting "Restrict the days of the week" does not display the days that can be selected by the customer in the backend. And, the setting can never be enabled after 1.1.40. After you enable it, it disables itself.

Steps to reproduce the issue

1. Install any version from 1.1.40
2. Create Accommodation Product
3. Go to Availability Tab and select the "Restrict the days of the week" setting
4. See it does not work

Before 1.1.40:

After 1.1.40, nothing happens:

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