fix "selected" error on show document

Author: Nicholas Newberry

app/views/documents/show.html.erb

@@ -1,5 +1,5 @@
 <div class="flex">
-  <%= render "shared/collection_list", collections: @collections %>
+  <%= render "shared/collection_list", collections: @collections, selected: @document.collection %>
 
   <div id="collection_area" class="overflow-y-scroll flex-1 h-screen bg-secondary-100 dark:bg-secondary-950 flextext-gray-700 dark:text-secondary-200">
     <%= render "shared/notice" %>