Reflect CompositeNode constructur signature changes

Fix compilation error in development branch of testbackend:

    [ERROR]     /Users/dk/development/projects/openworm/geppetto/org.geppetto.testbackend/src/main/java/org/geppetto/testbackend/services/DummySimulatorService.java:[294,39] no suitable constructor found for CompositeNode()
    constructor     org.geppetto.core.model.runtime.CompositeNode.CompositeNode(java.lang.String,java.lang.String) is not applicable
      (actual and formal argument lists differ in length)
    constructor org.geppetto.core.model.runtime.CompositeNode.CompositeNode(java.lang.String) is not applicable
      (actual and formal argument lists differ in length)
    [INFO] 1 error