#10098 moving disabled tab click handlers onto role=tabpanel elements fo...

...r better Voiceover announcement

Not sure if this is the best way to fix. Potentially this event binding is instead moved inside of `_processTabs` as it has to happen on the elem with `role="tablist"` to fix the bug
This would need to be after `_processTabs()` anyway, since the class generally won't be added by users, so this won't find anything.