Calendar rows should have role attribute

[davewrightOSF]

The calendar widget fails accessibility tests using the AXE chrome extension. This seems to be because the element with role=grid doesn't have children with role=row (or rowgroup). This is patched by adding the following jQuery...

$('.mbsc-cal-row').attr('role', 'row');

But should probably be added to core

[dioslaska]

Fixed in 4.10.0