calendar: Test with 2 calendars rather than 3
calendar: Test with 2 calendars rather than 3

Google’s poor little servers don’t like 3 calendars being created in quick
succession (although they definitely used to be OK with it), resulting in
the calendar query tests failing.

Reduce the number of test calendars used for such tests to 2, rather than 3.
That should hopefully fix the problem, although I can’t test the fix works
completely because I’ve run out of GData query quota for the day.

Closes: https://bugzilla.gnome.org/show_bug.cgi?id=679072

Pecisk/libgdata-gtasks,Pecisk/libgdata-gtasks,Pecisk/libgdata,GNOME/libgdata,Pecisk/libgdata,Distrotech/libgdata,Distrotech/libgdata,Pecisk/libgdata,pwithnall/libgdata,pwithnall/libgdata,Distrotech/libgdata,Pecisk/libgdata-gtasks