fix: selected state after loading from localStorage

[Chartman123]

This fixes #1780

[susnux]

What is the difference except from making is not reactive anymore?
Currently onChange is called which already should update the values in the submit view which then should propagade back through the props to the question.
This create a copy of the value and drops the reactivity as the values are never loaded back from the props if changed after mount.

[susnux]

Well I see why this is working: The question was never updated from Submit as the answers object in Submit is not reactive and thus the changed answers were not updated back on the question -> UI seems to be stuck.

This fixes it by creating a local copy of the values, but therefor loose any reactivity.