MINOR: Simplified the permission checks in WorkflowInstance->userHasAccess().
MINOR: Simplified the permission checks in WorkflowInstance->userHasAccess().

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