progressbar: changed value to have 'ui-widget-header' instead of 'ui-state-default'

Author: rdworth

ui/ui.progressbar.js

@@ -31,7 +31,7 @@ $.widget("ui.progressbar", {
 				"aria-valuenow": this._value()
 			});
 
-		this.valueDiv = $('<div class="ui-progressbar-value ui-state-default ui-corner-left"></div>').appendTo(this.element);
+		this.valueDiv = $('<div class="ui-progressbar-value ui-widget-header ui-corner-left"></div>').appendTo(this.element);
 
 		this._refreshValue();