More robust way of checking image is attached in Gmail

Waiting for the attached image icon to disappear is more reliable than waiting for the new view to appear on some 2-1 devices.

wlauto/workloads/gmail/uiauto/src/com/arm/wlauto/uiauto/UiAutomation.java

@@ -166,8 +166,8 @@ public class UiAutomation extends UxPerfUiAutomation {
                                                 .className("android.widget.GridView")
                                                 .childSelector(new UiSelector()
                                                 .index(i).className("android.widget.FrameLayout")));
-
-            clickUiObject(imageFileButton, timeout);
+            imageFileButton.click();
+            imageFileButton.waitUntilGone(timeout);
 
             result.end();