Fix regression that prevents calendar sync w/ new accounts

* The regression is caused by a check on whether the calendar is
  syncable, as determined by the status of the Calendar (via
  CalendarProvider2).
* Unfortunately, if there IS no calendar, we were disallowing sync,
  which prevents the calendar from being created in the first place

Bug: 2619755
Change-Id: I1e94a129413bdbe9bc9bfb3608d3ca95f23d8dfb

src/com/android/exchange/SyncManager.java

@@ -668,7 +668,9 @@ public class SyncManager extends Service implements Runnable {
         if (observer != null) {
             return (observer.mSyncEvents == 1);
         }
-        return false;
+        // If there's no observer, there's no Calendar in CalendarProvider2, so we return true
+        // to allow Calendar creation
+        return true;
     }
 
     private class CalendarObserver extends ContentObserver {