[DataGrid] fix Print export fails when footer is set to hide

[tarunrajput]

Fixes: #13015 When hideFooter option is true, grid footer is not rendered anymore. This PR adds a check to skip styling the grid footer element in that case.

• [x] I have followed (at least) the PR section of the contributing guide.

[tarunrajput]

@michelengelen, mind taking a look?

[michelengelen]

@cherniavskii or @MBilalShafi gentle ping on this one!

[mui-bot]

Deploy preview: https://deploy-preview-13034--material-ui-x.netlify.app/

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