The TablePagination component does not use the clsx function to merge the classes.root and the className property.

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

This leads to classes.root being discarded and replaced by className when both are supplied.

Expected Behavior 🤔

The clsx application should probably be used like in other components like TableBody, TableCell, etc.

Steps to Reproduce 🕹

In the following example, you may look at the console html and see that the classes are missing on the MuiTablePagination-root div.
https://codesandbox.io/s/create-react-app-8ho0q

Your Environment 🌎