fix(Table): 修复初始化 checkedKeys 被清空逻辑异常问题 (#802)

* fix: 修复初始化checkedKeys被清空逻辑异常问题

* feat: pr问题修改

---------

Co-authored-by: blankzhang <blankzhang@blankzhangdeMac-mini.local>

components/table/useTableSelect.ts

@@ -97,7 +97,7 @@ export default ({
 
     // 是否单选模式
     const isSingleSelect = computed(() => {
-        return selectionColumn.value && !selectionColumn.value.props.multiple;
+        return Boolean(selectionColumn.value && !selectionColumn.value.props.multiple);
     });
 
     const isSelectDisabled = ({ row }: { row: RowType }) => {
@@ -185,12 +185,8 @@ export default ({
     watch(
         isSingleSelect,
         () => {
-            // 切换后，清空当前选择
             clearSelect();
         },
-        {
-            immediate: true,
-        },
     );
 
     return {