Fix incorrect function visibility
Fix incorrect function visibility

DIA-NZ/silverstripe-externallinks,GOVTNZ/silverstripe-externallinks,GOVTNZ/silverstripe-externallinks,blpraveen/silverstripe-brokenlinks,DIA-NZ/silverstripe-externallinks,silverstripe-labs/silverstripe-externallinks,blpraveen/silverstripe-brokenlinks,silverstripe-labs/silverstripe-externallinks