Datepicker: Don't set _curInst in hideDatepicker. Fixes #8174 - jQuery datepicker is stuck open if label is clicked from open state.

Author: scottgonzalez

ui/jquery.ui.datepicker.js

@@ -801,10 +801,8 @@ $.extend(Datepicker.prototype, {
 		if (this._datepickerShowing) {
 			var showAnim = this._get(inst, 'showAnim');
 			var duration = this._get(inst, 'duration');
-			var that = this;
 			var postProcess = function() {
 				$.datepicker._tidyDialog(inst);
-				that._curInst = null;
 			};
 
 			// DEPRECATED: after BC for 1.8.x $.effects[ showAnim ] is not needed