🐛 Use configured class instead of hard-coded (#6717)

The baseline configuration for the `Hyrax::PcdmMemberPresenterFactory`
allows for us to specify the `file_presenter_class` and the
`work_presenter_class`.  However, in the case of `presenter_for` we were
not leveraging that configurability.

This commit rectifies that behavior.

Tagging along with this commit is a minor performance improvement.
Namely, check a simple boolean before we begin checking elements that
might require additional queries and/or loading additional objects.

app/presenters/hyrax/pcdm_member_presenter_factory.rb

@@ -98,9 +98,9 @@ def work_presenters
     def presenter_for(document:, ability:)
       case document['has_model_ssim'].first
       when *Hyrax::ModelRegistry.file_set_rdf_representations
-        Hyrax::FileSetPresenter.new(document, ability)
+        file_presenter_class.new(document, ability)
       else
-        Hyrax::WorkShowPresenter.new(document, ability)
+        work_presenter_class.new(document, ability)
       end
     end
 

app/presenters/hyrax/work_show_presenter.rb

@@ -63,10 +63,10 @@ def download_url
 
     # @return [Boolean] render a IIIF viewer
     def iiif_viewer?
-      representative_id.present? &&
+      Hyrax.config.iiif_image_server? &&
+        representative_id.present? &&
         representative_presenter.present? &&
         representative_presenter.image? &&
-        Hyrax.config.iiif_image_server? &&
         members_include_viewable_image?
     end