Always check serverId AND calendarId in queries

* With multiple accounts, serverId's are not guaranteed to be unique
  (indeed, they rarely are)
* There were two queries in CalendarSyncAdapter that checked only
  serverId and this has caused the referenced bug PLUS others that
  would have turned up later on
* This is a critical fix

Bug: 2589815
Change-Id: I49bc6cb5bb4708f4bf4ca60a891ff78f0b25e989
1 file changed