BI-129683 fix: 【6.0.12发散】文本下拉过滤组件绑定参数全选之后，全选按钮为半选导致取消勾选全选不能生效

packages/fineui/src/widget/multiselect/loader.js

@@ -289,11 +289,11 @@ export class MultiSelectInnerLoader extends Widget {
     }
 
     getAllButtons() {
-        return this.button_group.getAllButtons();
+        return this.cachGroup.getAllButtons();
     }
 
     getAllLeaves() {
-        return this.button_group.getAllLeaves();
+        return this.cachGroup.getAllLeaves();
     }
 
     getSelectedButtons() {