Use correct pattern to disallow actions on containers
Use correct pattern to disallow actions on containers

- Issue MatterHackers/MCCentral#4331
"Add to Bed" appears on folders

jlewin/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,mmoening/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,mmoening/MatterControl,mmoening/MatterControl