customHeadLabelRender: error resizing in mobile mode

## Expected Behavior
the customHeadLabelRender method must always return the value of the function

## Current Behavior
When resizing the page, the customHeadLabelRender method always returns the property name instead of the method value

## Steps to Reproduce (for bugs)

1. Resize the window
2. Check the value of the column header

## Your Environment

| Tech | Version |
|--------------|---------|
| Material-UI | latest |
| MUI-datatables | 4.1.0 |
| React | 17.0.2 |
| browser | chrome |
| etc | |