修复条码设置表达式时再次打开文件无法显示表达式内容的BUG

ureport2-js/src/panel/property/ZxingValueEditor.js

@@ -227,7 +227,7 @@ export default class ZxingValueEditor extends BaseValueEditor{
         }else{
             this.expressionEditorGroup.show();
             this.textEditorGroup.hide();
-            this.codeMirror.setValue(cellDef.value.value || '');
+            this.codeMirror.setValue(cellDef.value.expression.expr || '');
             this.expandGroup.show();
         }
         if(cellDef.value.category==='qrcode'){