Calendar: Remove usage of deprecated .focus( 1 )

Changed as proposed in jQuery UI upgrade guide:
http://jqueryui.com/upgrade-guide/1.11/#deprecated-focus-n

Author: fnagel

ui/calendar.js

@@ -76,7 +76,9 @@ return $.widget( "ui.calendar", {
 				// TODO Exclude clicks on lead days or handle them correctly
 				// TODO Store/read more then just date, also required for multi month picker
 				this._select( event, $( event.currentTarget ).data( "timestamp" ) );
-				this.grid.focus( 1 );
+				this._delay( function() {
+					this.grid.focus();
+				} );
 			},
 			"mouseenter .ui-calendar-header button": "_hover",
 			"mouseleave .ui-calendar-header button": "_hover",
@@ -132,7 +134,9 @@ return $.widget( "ui.calendar", {
 
 		if ( this.date.month() !== oldMonth || this.date.year() !== oldYear ) {
 			this.refresh();
-			this.grid.focus( 1 );
+			this._delay( function() {
+				this.grid.focus();
+			} );
 		}
 
 		this._setActiveDescendant();

ui/datepicker.js

@@ -119,7 +119,9 @@ var widget = $.widget( "ui.datepicker", {
 				clearTimeout( this.closeTimer );
 				this._delay( function() {
 					this.open( event );
-					this.calendarInstance.grid.focus( 1 );
+					this._delay( function() {
+						this.calendarInstance.grid.focus();
+					} );
 				}, 1 );
 				break;
 			}