forms: Fix corruption on list item prop validation

If a list item properties form was unable to be saved (likely due to
validation errors) properties for other list items would not be loaded
correctly (via AJAX) afterwards.

include/staff/templates/list-item-properties.tmpl.php

@@ -9,7 +9,7 @@
                     form.closest('.dialog').hide();
                     $('#overlay').hide();
                 } else {
-                    form.closest('.dialog').empty().append(data);
+                    form.closest('.dialog .body').empty().append(data);
                 }
             });
             return false;">