Increase date-picker width to fix alignment issue for different zoom levels

What is in this MR

• See https://community.baserow.io/t/calendar-is-out-two-days/2382/10

How to test this MR

• With a 4K monitor, decrease the browser zoom to 90% and see that the date-picker show some weird alignment for days. Switch to this branch and see the date-picker show the calendar correctly to every zoom level down to 25%

Closes https://staging.baserow.io/database/648/table/52457