style: 树形菜单样式

src/components/TreeFilter/index.scss

@@ -25,6 +25,7 @@
     :deep(.el-tree--highlight-current) {
       .el-tree-node.is-current > .el-tree-node__content {
         background-color: var(--el-color-primary);
+        border-radius: 6px;
         .el-tree-node__label,
         .el-tree-node__expand-icon {
           color: white;