fix(tasklist): task highlighting IE9
fix(tasklist): task highlighting IE9

related to #CAM-1320

xlinur/camunda-bpm-webapp,tcrossland/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,nagyistoce/camunda-bpm-webapp,tcrossland/camunda-bpm-webapp,jangalinski/camunda-bpm-webapp,tcrossland/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,nagyistoce/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,jangalinski/camunda-bpm-webapp,nagyistoce/camunda-bpm-webapp,jangalinski/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,xlinur/camunda-bpm-webapp