improve(less-build): remove bootstrap/less import path
improve(less-build): remove bootstrap/less import path

doing so will prevent name collisions

Related to CAM-6156

TitanUser/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp