[poppler] Radio button siblings

[Albert Astals Cid]

Hi, while having a look at https://bugs.kde.org/show_bug.cgi?id=302334 i 
realized we were filling the siblings of a form field wrong, we were doing it 
at the widget level instead of at the field level.

This patch fixes this and makes the pdf work correctly in Okular.

Interestingly the pdf already works on evince even though evince is not using 
the getSiblings method, i guess the glib frontend may be exporting the 
child/parent structure and using that for their radio decision.

Anyone against commiting this to both 0.20 and master?

Cheers,
  Albert
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