[BUG] Auto width doesn't factor in header column length

[decaf-dev]

Describe the bug

Auto width only calculates the body cell sizes and ignores the header cell size. This means that the header will show ellipsis when it should be full width

To Reproduce

1. Set toggleAuto Width to true
2. Make sure that the header text is longer than any cell text in the column
3. See ellipsis

Expected behavior

The header text should be fully expanded. No ellipsis.

Screenshots

Using Mobile App?

No