fix(variable): restore the correct variable directive name
fix(variable): restore the correct variable directive name

Related to CAM-3749

tcrossland/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,nagyistoce/camunda-cockpit-ui,nagyistoce/camunda-cockpit-ui,xlinur/camunda-bpm-webapp,tcrossland/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,tcrossland/camunda-bpm-webapp,xlinur/camunda-bpm-webapp