Allowed dates styles are missing for month picker for years that aren't passed

[DmitryTar1]

Describe the bug
Allowed dates styles are missing for month picker for years that aren't passed as allowedDates.
It's related to #1008
Now months disabled only if passed at least one month in that year.

To Reproduce
Steps to reproduce the behavior:

1. Use code from documentation https://vue3datepicker.com/props/calendar-configuration/#allowed-dates
2. Set allowed dates to different years, e.g. ['2018-01-01', '2016-01-01', '2019-05-01']
3. When you open year 2017 or any year that aren't in the array, they all doesn't have style to show that they aren't selectable.

Expected behavior
All years that are displayed will have styles for months to show that they aren't selectable if they aren't in the array of allowed dates.

Screenshots

Desktop & mobile (please complete the following information):

• Browser chrome, but I suppose all
• Library version 10.0.0