Remove institutional credential from profile edit

The view was showing ways of linking an account with external
authenticators for SHIBBOLETH. We had decided to remove this
functionality but this view was missed.

app/views/devise/registrations/_personal_details.html.erb

@@ -60,8 +60,10 @@
     </div>
   <% end %>
 
+  <!-- SHIBBOLETH CREDENTIALS -->
   <% @identifier_schemes.each do |scheme| %>
     <div class="form-group col-xs-8">
+      <% next if scheme.name.downcase == 'shibboleth' && !Rails.application.config.shibboleth_enabled %>
       <% if scheme.name.downcase == 'shibboleth' %>
         <label class='control-label'>
           <span class="aria-only" aria-hidden="false"><%= _('Institutional credentials') %></span>