PCP : Disabled and "Not Approved" PCP rows should use disabled css class

When displaying PCP's in a selector, add css .disabled class to row if they are inactive or "Not Approved"

NOTE: For civicrm_pcp.status_id please use CRM_Core_OptionGroup::getValue( 'pcp_status', 'Not Approved', 'name' ) rather than hard-coding a value. (I fixed this in Page/PCPInfo.php which was using hard-code status of 2 to see if a page was Approved.)