update code style

components/table/demo/custom-filter-panel.md

@@ -91,7 +91,11 @@ class App extends React.Component {
       ),
       filterIcon: <Icon type="smile-o" style={{ color: this.state.filtered ? '#108ee9' : '#aaa' }} />,
       filterDropdownVisible: this.state.filterDropdownVisible,
-      onFilterDropdownVisibleChange: visible => this.setState({ filterDropdownVisible: visible }, () => this.searchInput.focus()),
+      onFilterDropdownVisibleChange: (visible) => {
+        this.setState({
+          filterDropdownVisible: visible,
+        }, () => this.searchInput.focus());
+      },
     }, {
       title: 'Age',
       dataIndex: 'age',