Update ZxcvbnScriptContributor.cs

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Packages/Volo/Abp/AspNetCore/Mvc/UI/Packages/Zxcvbn/ZxcvbnScriptContributor.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using Volo.Abp.AspNetCore.Mvc.UI.Bundling;
 
 namespace Volo.Abp.AspNetCore.Mvc.UI.Packages.Zxcvbn;
@@ -6,6 +7,6 @@ public class ZxcvbnScriptContributor : BundleContributor
 {
     public override void ConfigureBundle(BundleConfigurationContext context)
     {
-        context.Files.Add("/libs/zxcvbn/zxcvbn.js");
+        context.Files.AddIfNotContains("/libs/zxcvbn/zxcvbn.js");
     }
 }