Update field name to component ID to match delegate class

This commit fixes a bug I ran into when testing the workflow example on the newest version of dynamic extensions.

You'll get this nice non-descript error if you have verbose enough debug logs:
```
04:22:20,329 DEBUG [org.activiti.engine.impl.interceptor.CommandContext] Error while closing command context
org.activiti.engine.ActivitiIllegalArgumentException: Field definition uses unexisting field 'taskId' on class com.github.dynamicextensionsalfresco.workflow.activiti.DelegateTask
```