androidTest: DialogFragmentIT: remove unneeded shortSleep in @Before

Leftover from testing

Signed-off-by: Álvaro Brey <alvaro.brv@gmail.com>

src/androidTest/java/com/owncloud/android/ui/dialog/DialogFragmentIT.java

@@ -79,7 +79,6 @@ public class DialogFragmentIT extends AbstractIT {
     public void quitLooperIfNeeded() {
         if (Looper.myLooper() != null) {
             Looper.myLooper().quitSafely();
-            shortSleep();
         }
     }