Datepicker: Remove unnecessary mouseover trigger

Fixes #5816
Closes jquerygh-974

Author: rxaviers

ui/datepicker.js

@@ -797,7 +797,7 @@ $.extend(Datepicker.prototype, {
 		datepicker_instActive = inst; // for delegate hover events
 		inst.dpDiv.empty().append(this._generateHTML(inst));
 		this._attachHandlers(inst);
-		inst.dpDiv.find("." + this._dayOverClass + " a").mouseover();
+		inst.dpDiv.find("." + this._dayOverClass + " a");
 
 		var origyearshtml,
 			numMonths = this._getNumberOfMonths(inst),