feat: 优化weapp标段检查中间件，移除冗余代码

app/middleware/weapp_tender_check.js

@@ -29,7 +29,6 @@ module.exports = options => {
             }
             const isTenderTourist = await ctx.service.tenderTourist.getDataByCondition({ tid: tender.id, user_id: accountId });
             tender.isTourist = isTenderTourist !== null;
-            tender.isTourist = isTenderTourist !== null;
             ctx.tender = tender;
             await next();
         } catch (err) {