revert requirement for 'update' module, which is not yet in Drupal core, but...

revert requirement for 'update' module, which is not yet in Drupal core, but slipped in with http://drupal.org/cvs?commit=71956

profiles/default/default.profile

@@ -8,7 +8,7 @@
  *  An array of modules to be enabled.
  */
 function default_profile_modules() {
-  return array('color', 'comment', 'help', 'taxonomy', 'dblog', 'update');
+  return array('color', 'comment', 'help', 'taxonomy', 'dblog');
 }
 
 /**