Update index.zh-CN.md

there are two "theme" in the table

components/layout/index.zh-CN.md

@@ -100,7 +100,6 @@ title: Layout
 | trigger | 自定义 trigger，设置为 null 时隐藏 trigger | string\|ReactNode | - |
 | width | 宽度 | number\|string | 200 |
 | onCollapse | 展开-收起时的回调函数，有点击 trigger 以及响应式反馈两种方式可以触发 | (collapsed, type) => {} | - |
-| theme | 主题颜色 | string: `light` `dark` | `dark` |
 | onBreakpoint | 触发响应式布局[断点](/components/grid#api)时的回调 | (broken) => {} | - |
 
 #### breakpoint width