feat(UserCenter): remove icon from logout modal cancel button

Remove the HomeOutlined icon from the cancel button of the logout
confirmation modal. The button now only displays the text "保持登录".

src/page/UserCenter.tsx

@@ -81,7 +81,6 @@ export const UserCenter = () => {
             maskClosable: true,
             title: '确认登出？',
             cancelText: '保持登录',
-            cancelButtonProps: { icon: <HomeOutlined /> },
             okText: '确认登出',
             okButtonProps: {
               icon: <LogoutOutlined />,