Support valkyrie 2.0.0 in ConverterValueMapper
Support valkyrie 2.0.0 in ConverterValueMapper

Valkyrie 2.0.0 treats more values as frozen, so we can't do `#map!` in
permission arrays. Instead of converting inline, return a new permission array
when converting permission values.

samvera/hyrax,samvera/hyrax,samvera/hyrax,samvera/hyrax