Widget Factory: Fix rendering negative progressbar value

Closes jquerygh-454

Author: Ahmed Abdel Razzak

page/jquery-ui/widget-factory/how-to-use-the-widget-factory.md

@@ -118,6 +118,7 @@ $.widget( "custom.progressbar", {
 		value: 0
 	},
 	_create: function() {
+		this.options.value = this._constrain(this.options.value);
 		this.element.addClass( "progressbar" );
 		this.refresh();
 	},
@@ -157,6 +158,7 @@ $.widget( "custom.progressbar", {
 		value: 0
 	},
 	_create: function() {
+		this.options.value = this._constrain(this.options.value);
 		this.element.addClass( "progressbar" );
 		this.refresh();
 	},
@@ -257,6 +259,7 @@ $.widget( "custom.progressbar", {
 		value: 0
 	},
 	_create: function() {
+		this.options.value = this._constrain(this.options.value);
 		this.element.addClass( "progressbar" );
 		this.refresh();
 	},