🐛 Fix custom thumbnail showing on searches

This commit will remove a Hyrax override that seemed to be causing some
issues with the search list view and also bring in a fix from PALs with
to address the search gallery view.

Ref:
  - #122
  - scientist-softserv/palni-palci#540

app/views/catalog/_index_gallery_collection_wrapper.html.erb

@@ -1,8 +1,9 @@
-<%# OVERRIDE Hyrax 3.4.1: make collection thumbnail a link so it matches works %>
-<div class="document col-xs-6 col-md-3">
+<%# OVERRIDE: Hyrax 3.5 to use render_thumbnail_tag for gallery view partial %>
+<div class="document col-6 col-md-3">
   <div class="thumbnail">
-    <% value = collection_thumbnail(document, {}, counter: document_counter_with_offset(document_counter)) %>
-    <%= link_to value, generate_work_url(document.to_h, request)%>
+    <%# OVERRIDE begin %>
+    <%= render_thumbnail_tag document, {}, { full_url: true } %>
+    <%# OVERRIDE end %>
     <div class="caption">
       <%= render_document_partials document, blacklight_config.view_config(:gallery).partials, :document_counter => document_counter %>
     </div>