BUG: make menu icon work in 3.1
BUG: make menu icon work in 3.1

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