Make QA work for allinson_flex

Allinson Flex profiles don't have an option other than indicating which
fields to be facetable.  This commit will make QA work for Allinson Flex
by assuming the field names "rights_statement" and "license" will be QA
fields.

lib/iiif_print/metadata.rb

@@ -67,7 +67,7 @@ def scrub(value)
     def cast_to_value(field_name:, options:)
       if options&.[](:render_as) == :faceted
         faceted_values_for(field_name: field_name)
-      elsif options&.[](:render_as) == :rights_statement || options&.[](:render_as) == :license
+      elsif qa_field?(field_name: options&.dig(:render_as)) || qa_field?(field_name: field_name)
         authority_values_for(field_name: field_name)
       else
         make_link(values_for(field_name: field_name))
@@ -85,6 +85,12 @@ def faceted_values_for(field_name:)
       end
     end
 
+    def qa_field?(field_name:)
+      # assuming that rights_statement and license are fields that use questioning authority
+      # this will allow Allinson Flex applications that don't have render_as options to still use QA
+      ['rights_statement', 'license'].include?(field_name.to_s)
+    end
+
     def authority_values_for(field_name:)
       authority = Qa::Authorities::Local.subauthority_for(field_name.to_s.pluralize)
       values_for(field_name: field_name).map do |value|