Datepicker: Reset this.maxRows (rows in a month) on each row in a multi-row datepicker.

(cherry picked from commit ed78020)

Author: kborchers

ui/jquery.ui.datepicker.js

@@ -1471,6 +1471,7 @@ $.extend(Datepicker.prototype, {
 		var html = '';
 		for (var row = 0; row < numMonths[0]; row++) {
 			var group = '';
+			this.maxRows = 4;
 			for (var col = 0; col < numMonths[1]; col++) {
 				var selectedDate = this._daylightSavingAdjust(new Date(drawYear, drawMonth, inst.selectedDay));
 				var cornerClass = ' ui-corner-all';