Update webodm.sh

Added cleanup of dangling images on rebuild

webodm.sh

@@ -78,6 +78,7 @@ rebuild(){
 	run "rm -fr node_modules/ || sudo rm -fr node_modules/"
 	run "rm -fr nodeodm/external/node-OpenDroneMap || sudo rm -fr nodeodm/external/node-OpenDroneMap"
 	run "docker-compose build --no-cache"
+	run "docker images --no-trunc -aqf \"dangling=true\" | xargs docker rmi"
 	echo -e "\033[1mDone!\033[0m You can now start WebODM by running $0 start"
 }