Allow the openseadgragon view to accept more flexible view_config

app/views/catalog/_openseadragon_default.html.erb

@@ -1,5 +1,6 @@
 <%
-  image = document.to_openseadragon(blacklight_config.view_config(:show))
+  view_config = local_assigns[:view_config] || blacklight_config&.view_config(document_index_view_type)
+  image = document.to_openseadragon(view_config)
   id_prefix = osd_html_id_prefix
 %>
 <%

spec/views/catalog/_openseadragon_default.html.erb_spec.rb

@@ -1,22 +1,27 @@
 require 'spec_helper'
 
-describe "catalog/openseadragon_default" do
+describe 'catalog/openseadragon_default' do
   let(:document) { SolrDocument.new }
   let(:blacklight_config) { Blacklight::Configuration.new }
-  let(:p) { "catalog/openseadragon_default" }
+  let(:p) { 'catalog/openseadragon_default' }
 
   before do
-    allow(view).to receive_messages(blacklight_config: blacklight_config, openseadragon_picture_tag: "<img />")
     allow(document).to receive_messages(to_openseadragon: [])
+    allow(view).to receive_messages(
+      blacklight_config: blacklight_config,
+      documents: [document],
+      document_index_view_type: 'embed',
+      openseadragon_picture_tag: '<img />'
+    )
   end
 
-  it "should render the openseadragon container" do
+  it 'should render the openseadragon container' do
     render partial: p, locals: { document: document }
-    expect(rendered).to have_selector ".openseadragon-container"
+    expect(rendered).to have_selector '.openseadragon-container'
   end
 
-  it "should support passing a container class" do
-    render partial: p, locals: { document: document, osd_container_class: "custom-container" }
-    expect(rendered).to have_selector ".custom-container"
+  it 'should support passing a container class' do
+    render partial: p, locals: { document: document, osd_container_class: 'custom-container' }
+    expect(rendered).to have_selector '.custom-container'
   end
 end