Update unit test to fix instances of random fails

Author: Julian Kast

android/sdl_android/src/androidTest/java/com/smartdevicelink/managers/screen/TextAndGraphicManagerTests.java

@@ -275,6 +275,7 @@ public void testDispose() {
 
     @Test
     public void testOperationManagement() {
+        textAndGraphicManager.transactionQueue.pause();
         textAndGraphicManager.isDirty = true;
         textAndGraphicManager.updateOperation = null;
         textAndGraphicManager.update(null);