fix(material/radio): clear selected radio button from group #27466
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In #18081 the radio group was changed so that deselected buttons receive
tabindex="-1"
when there's a selected button. The problem is that we weren't clearing the reference to the selected button so it gets removed, the deselected buttons become unfocusable using the keyboard.These changes clear the selected radio button on destroy.
Fixes #27461.