"isHeaderViewVisible" only hide the subview without resizing the timelinePageViewer

[Jhegs]

New Issue Checklist

• [x] Use the latest version of CalendarKit
• [x] I've read the Contribution Guidelines
• [x] I've searched for existing GitHub issues

Issue Description

After to set the property to false, this sentence only hide the dayHeaderView view leaving a white space (The green background is just for reference)

myView.isHeaderViewVisible = false

Result I am trying to achieve

The possible fix that needs a change in the library.

I did a small change on the file DayView (inside CalendarKit) project removing the else

// Before
override public func layoutSubviews() {
    super.layoutSubviews()
    if #available(iOS 11, *) {} else {
        ...
    }
  }

// After
override public func layoutSubviews() {
    super.layoutSubviews()
    if #available(iOS 11, *) { // Removing the else case
        ...
    }
  }

and the frame is recalculated.

Final Note

To be sure that I'm not doing something wrong in my project I did the same change trying with the CalendarKitDemo project inside this repository and the bug is present.

[richardtop]

It's a confirmed bug