Fix intermittent race condition in SyncCalendarTests

Fixes this problem, which (presumably) happens when the test starts before
the calendar has been synced:

junit.framework.AssertionFailedError: Daily recurring event should have been deleted. expected:< 1 > but was:< 319 >
at com.android.providers.calendar.SyncCalendarTest.testCreateAndDeleteNewRecurringEvent(SyncCalendarTest.java:54)
[...]
diff --git a/tests/src/com/android/providers/calendar/SyncCalendarTest.java b/tests/src/com/android/providers/calendar/SyncCalendarTest.java
index 121e342..d183042 100644
--- a/tests/src/com/android/providers/calendar/SyncCalendarTest.java
+++ b/tests/src/com/android/providers/calendar/SyncCalendarTest.java
@@ -45,6 +45,7 @@
     }
 
     public void testCreateAndDeleteNewRecurringEvent() throws Exception {
+        syncCalendar();
         int countBeforeNewEvent = getEventsCount();
         Uri insertUri = insertEvent(dailyRecurringEvent);