Fix leftover rename

Author: amarziali

dd-trace-core/src/test/groovy/datadog/trace/core/CoreTracerTest.groovy

@@ -454,7 +454,7 @@ class CoreTracerTest extends DDCoreSpecification {
   def "test local root service name override"() {
     setup:
     def tracer = tracerBuilder().writer(new ListWriter()).serviceName("test").build()
-    tracer.updatePreferredServiceName(preferred)
+    tracer.updatePreferredServiceName(preferred, preferred)
     when:
     def span = tracer.startSpan("", "test")
     span.finish()