Correct test clean up order on IAM tests

* Moved TestHelpers.afterTestCleanup() to run last as part of the
cleanup after each test as InAppMessagingHelpers.clearTestState()
can kick of threads and backgournd work which sometimes carrries
over to the next test.

Author: jkasten2

OneSignalSDK/unittest/src/test/java/com/test/onesignal/InAppMessageIntegrationTests.java

@@ -149,9 +149,8 @@ public void afterEachTest() throws Exception {
         ShadowDynamicTimer.shouldScheduleTimers = true;
         ShadowDynamicTimer.hasScheduledTimer = false;
         OneSignal.setInAppMessageClickHandler(null);
-        TestHelpers.afterTestCleanup();
-
         InAppMessagingHelpers.clearTestState();
+        TestHelpers.afterTestCleanup();
     }
 
     @Test