[fix WeBankFinTech#572] fix bug that apiservice can't get result

What is the purpose of the change
fix WeBankFinTech#572, that apiservice can't get result

Brief change log
update execute.js

Verifying this change
yes.

Does this pull request potentially affect one of the following parts:
Dependencies (does it add or upgrade a dependency): no
Anything that affects deployment: yes
The Core framework, i.e., AppConn, Orchestrator, ApiService.: no
Documentation
Does this pull request introduce a new feature? no
If yes, how is the feature documented? not documented

web/src/common/service/execute.js

@@ -376,6 +376,7 @@ Execute.prototype.getFirstResult = function() {
       taskID: this.taskID,
       status: this.status,
     });
+    const pageSize = 5000;
     let params = {
       path: this.currentResultPath,
       pageSize,
@@ -385,7 +386,7 @@ Execute.prototype.getFirstResult = function() {
       params.taskId = this.taskID
     }
     const url = `/${this.getResultUrl}/openFile`;
-    const pageSize = 5000;
+
     api.fetch(url, params, 'get')
       .then((rst) => {
         this.trigger('result', rst);