Fix calendar system checks for pascha
Review Request #129667 - Created Dec. 18, 2016 and submitted
Date of pascha is currently computed wrongly. Commit b47ddff6 (switch from KCalendarSystem to QCalendarSystem) reversed all calendar system checks from equality to inequality in HolidayParserDriverPlan::pascha(), it seems to me by error (e.g. the first check is always true after the change). After reverting to equality checks, pascha date computation is correct.