show meaningful user name in group audit windows

Author: rhodges

mapgroups/templates/mapgroups/mapgroup_detail_content.html

@@ -154,7 +154,7 @@ <h4>Shapes</h4>
                           data-drawing_id="{{ object.pk }}"
                           data-drawing_name="{{ object.name }}"
                           data-drawing_owner_id="{{ object.user.pk }}"
-                          data-drawing_owner_name="{{ object.user.username }}"
+                          data-drawing_owner_name="{{ object.user.get_short_name }}"
                           data-drawing_description="{{ object.description }}"
                           data-user_admin_url="{{ user_admin_root_url }}"
                           data-drawing_admin_url="{{ drawing_admin_root_url }}"
@@ -195,7 +195,7 @@ <h4>User-Imported Layers</h4>
                           data-userlayer_id="{{ object.pk }}"
                           data-userlayer_name="{{ object.name }}"
                           data-userlayer_owner_id="{{ object.user.pk }}"
-                          data-userlayer_owner_name="{{ object.user.username }}"
+                          data-userlayer_owner_name="{{ object.user.get_short_name }}"
                           data-userlayer_description="{{ object.description }}"
                           data-userlayer_user_admin_url="{{ user_admin_root_url }}"
                           data-userlayer_admin_url="{{ user_layer_admin_root_url }}"