affiliations: update value property to use id

[0einstein0]

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Description

Partially Closes: #268

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[kpsherva]

I think it was changed back and forth several time, could you explain why is it needed?

[0einstein0]

The value prop was being used to set the selected value in the search input box, when for instance RWTH Aachen University was selected which was coming from two diff sources i.e. ror and edmo but had the same name in both, it selected both of them even if you click on one of them and the two entries would be selected in the input box as it was based on name which is not unique.