numberToSimpleDate returns day 0 for 31 December of some years when leapYear1900 is true #1793

With leapYear1900: true, numberToSimpleDate decomposes 31 December of 32 years between 1900 and 2200 (for example 2036 and 2040) as day 0 of January of the next year. =EOMONTH(DATE(2036,12,31),0) returns 31 January 2037, and TEXT of that serial shows 2037-01-00. It happens with and without nullDate 1899-12-31.

The year check in that function compares against {year: year - 1, …} where {year, …} looks intended. Changing it brings the 32 affected years to 0 in both leap configurations, leaves the default configuration unchanged, and the 80 date, EDATE, EOMONTH and DAY specs I ran still pass.

Found while reviewing #1781. That PR doesn't cause it.