Use UseVirtualStaticFiles for AllowedExtraWebContentFolders first.

Resolve #21592

Author: maliming

framework/src/Volo.Abp.AspNetCore/Microsoft/AspNetCore/Builder/AbpApplicationBuilderExtensions.cs

@@ -177,14 +177,14 @@ public static StaticAssetsEndpointConventionBuilder MapAbpStaticAssets(this IApp
             throw new AbpException("The app(IApplicationBuilder) is not an IEndpointRouteBuilder.");
         }
 
-        app.UseVirtualStaticFiles();
-
         var options = app.ApplicationServices.GetRequiredService<IOptions<AbpAspNetCoreContentOptions>>().Value;
         foreach (var folder in options.AllowedExtraWebContentFolders)
         {
             app.UseVirtualStaticFiles(folder);
         }
 
+        app.UseVirtualStaticFiles();
+
         return endpoints.MapStaticAssets(staticAssetsManifestPath);
     }