BUG:WEB方式使用UseCustomStore载入报表时主题丢失

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问题：Web 13版本报表，使用UseCustomStore载入报表时，如果在报表设计时选择了主题色，则预览后丢失主题色。

重现：

使用AR13 SP2自带的WebDesigner_MVC范例，修改Startup.cs如下：

using System;
using System.IO;
using System.Linq;
// using Microsoft.Extensions.Configuration;
using System.Web;
using GrapeCity.ActiveReports.Aspnet.Designer;
using GrapeCity.ActiveReports.Aspnet.Viewer;

using WebDesigner_MVC.Implementation;
using WebDesigner_MVC.Services;
using Owin;
using Microsoft.Owin;
using Microsoft.Owin.StaticFiles;
using Microsoft.Owin.FileSystems;
using System.Web.Mvc;
using System.Web.Routing;
using GrapeCity.ActiveReports;

[assembly: OwinStartup(typeof(WebDesigner_MVC.Startup))]

namespace WebDesigner_MVC
{
public class Startup
{
private static readonly DirectoryInfo ResourcesRootDirectory =
new DirectoryInfo(String.Format(@"{0}.\resources\", HttpRuntime.AppDomainAppPath));
private static readonly DirectoryInfo TemplatesRootDirectory =
new DirectoryInfo(String.Format(@"{0}.\templates\", HttpRuntime.AppDomainAppPath));
private static readonly DirectoryInfo DataSetsRootDirectory =
new DirectoryInfo(String.Format(@"{0}.\datasets\", HttpRuntime.AppDomainAppPath));

public void Configuration(IAppBuilder app)
{
app.UseErrorPage();

var dataSetsService = new FileSystemDataSets(DataSetsRootDirectory);
var templatesService = new FileSystemTemplates(TemplatesRootDirectory);
app.Use((context, next) =>
{
context.Set(typeof(IDataSetsService).ToString(), dataSetsService);
context.Set(typeof(ITemplatesService).ToString(), templatesService);
return next.Invoke();
});
app.UseDesigner(config => config.UseFileStore(ResourcesRootDirectory, true ));

app.UseReporting(
            config => {
                  //原代码
                  //config.UseFileStore(ResourcesRootDirectory);
                  //重现的代码
                  config.UseCustomStore(reportId =>
                  {
                     var fileInfo = new FileInfo(Path.Combine(String.Format(@"{0}.\resources\", HttpRuntime.AppDomainAppPath), reportId));
                     PageReport report= new PageReport(fileInfo);
                     return report.Report;
                  });

            }
         );

app.UseStaticFiles(new StaticFileOptions { FileSystem = new PhysicalFileSystem(String.Format(@"{0}.\wwwroot\", HttpRuntime.AppDomainAppPath)) });
}
}
}