fix: "Now" action row button works with multi-days

[piotr-m-bielski]

Describe your changes

The changes fix a problem with the 'now' button combined with multiple dates. More details can be found in an issue. I haven't changed the behavior for the month-picker, time-picker, and other similar components, where the 'now' button also doesn't work

Issue ticket number and link

https://github.com/Vuepic/vue-datepicker/issues/1000

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have ensured that unit tests pass without errors
• [ ] If it is a new feature, I have added a new unit test