Remove unnecessary +1ms to quota window calculation.

In the simple case of a quota of 1, if an alarm goes off at time t into
the window (assume a window [0, w)), the next alarm is eligible at time 
(t + w) and not (t + w + 1). There was no clear reason to add the extra 
1 ms, so we're removing it.

Bug: 148623696
Test: atest CtsAlarmManagerTestCases
Test: atest FrameworksMockingServicesTests:AlarmManagerServiceTest
Change-Id: Ib66cfc7020efb6dd94d189efeaeb41db48097144