fix: dynamically calculate th aria role

[TomPridham]

partially addresses #1012
This covers the problem brought up in the initial issue. There didn't seem to be other ancestor checks in this file, so I didn't attempt to do the role=cell and role=gridcell cases in the second comment. I'm also unsure if you could actually end up with that without explicitly setting the role to those since scope will always be either row, rowgroup, col, colgroup, or auto and based on this https://html.spec.whatwg.org/multipage/tables.html#attr-th-scope it seems like it always acts as a header or some sort

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