use qualified name for ArrayList (the new relast does nto import it)

ros2rag.example/build.gradle

@@ -110,7 +110,7 @@ task relastToJastAdd(type: JavaExec) {
     args(["../libs/relast.jar",
             "--grammarName=./src/gen/jastadd/model",
             "--useJastAddNames",
-            "--listClass=ArrayList",
+            "--listClass=java.util.ArrayList",
             "--jastAddList=JastAddList",
             "--resolverHelper",
             "--file"]