Fix RED.util property name.
Fix RED.util property name.

mblackstock/node-red-web-nodes,node-red/node-red-web-nodes,drwoods/node-red-web-nodes,mblackstock/node-red-web-nodes,SenseTecnic/node-red-web-nodes,drwoods/node-red-web-nodes,SenseTecnic/node-red-web-nodes,node-red/node-red-web-nodes