🐛 Fix unpermitted params

This commit will fix the unpermitted params error that occurs when
trying to save the form.  It seemed that shoveling the terms in broke
functionality for other terms.  Instead we override the class method and
add it to the array of terms.

app/forms/hyrax/pdf_form_behavior.rb

@@ -9,13 +9,18 @@ module PdfFormBehavior
 
       self.terms += %i[show_pdf_viewer show_pdf_download_button]
       self.hidden_terms = %i[show_pdf_viewer show_pdf_download_button]
-      # Not sure why this is needed but the form was not working without it
-      # it was getting a Unpermitted parameter error for these terms
-      permitted_params << %i[show_pdf_viewer show_pdf_download_button]
     end
 
     def hidden?(key)
       hidden_terms.include? key.to_sym
     end
+
+    class_methods do
+      # Not sure why this is needed but the form was no working without it
+      # it was getting an Unpermitted paratemter error for these terms
+      def permitted_params
+        super + %i[show_pdf_viewer show_pdf_download_button]
+      end
+    end
   end
 end