[Thread] fix the failure in ThreadIntegrationTest

This test had an assumption that Thread is enabled which is not true. This CL enables Thread in the setUp().

Bug: 397583601
Change-Id: I9c4d5028a663c6fe1c581267ff7d172d0cba577c

thread/tests/integration/src/android/net/thread/ThreadIntegrationTest.java

@@ -130,6 +130,7 @@ public class ThreadIntegrationTest {
     public void setUp() throws Exception {
         mExecutor = Executors.newSingleThreadExecutor();
         mOtCtl = new OtDaemonController();
+        mController.setEnabledAndWait(true);
         mController.leaveAndWait();
 
         // TODO: b/323301831 - This is a workaround to avoid unnecessary delay to re-form a network