[v7] Resource columns having a non-overridable 50px minimum width

Reduced Test Case

https://codepen.io/leroydev/pen/JoWYmrJ

Do you understand that if a reduced test case is not provided, we will intentionally delay triaging of your ticket?

• I understand

Which connector are you using (React/Angular/etc)?

No connector (vanilla JS)

Bug Description

In v7, resource columns have gotten a minimum width of 50px. If I set a resource column to width: 35 it will still be 50px: Codepen

While in v6, I was free to set width: 35 and it'd be applied: Codepen

For us this is a limitation we don't want and thus for now we have applied a monkeypatch by setting SPREADSHEET_COL_MIN_WIDTH to 0. This limitation was not in the changelog: https://fullcalendar.io/docs/upgrading-from-v6