Fix: #4902, 🐛 Fix the click of week numbers when the first day of the week is not enabled

[balajis-qb]

Closes Hacker0x01#4902

Problem
As described in the linked issue, the problem occurs when we disable the first week of the day and using excludeDateIntervals whereas the other days of the week are enabled. In this case the select of the week number is not working.

Changes

• Select the first-enabled day of the week whenever the first day of the week is disabled (Currently it's returning the first day of the week when the first day is not disabled, else it's not selecting anything)
• Added corresponding test cases to validate the changes

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.