Minor fix limit the users list to the users with access to the workflows dashboard
Minor fix limit the users list to the users with access to the workflows dashboard

dnadesign/advancedworkflow,silverstripe-australia/advancedworkflow,silverstripe-terraformers/advancedworkflow,icecaster/advancedworkflow,icecaster/advancedworkflow,silverstripe-australia/silverstripe-advancedworkflow,silverstripe-australia/advancedworkflow,silverstripe-australia/silverstripe-advancedworkflow,dnadesign/advancedworkflow,silverstripe-terraformers/advancedworkflow