make preventDefaultEvent input's default value to true to keep it as default behavior

Author: mecp

projects/angular2-draggable/src/lib/angular-resizable.directive.ts

@@ -103,7 +103,7 @@ export class AngularResizableDirective implements OnInit, OnChanges, OnDestroy,
   @Input() rzMaxHeight: number = null;
 
   /** Whether to prevent default event */
-  @Input() preventDefaultEvent = false;
+  @Input() preventDefaultEvent = true;
 
   /** emitted when start resizing */
   @Output() rzStart = new EventEmitter<IResizeEvent>();