CRM-15180, now we disable non-selectable tags

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* CRM-15180: Using the taglist style of the "contact" page for the "new contact" page
  https://issues.civicrm.org/jira/browse/CRM-15180
according to the jQuery docs, attr will work for multiple elements so this statement could be simplified - it doesn't need the call to .attr() to be nested inside an .each(function() construct, you can just call attr directly.