🐛 [BUG]legend.domStyles该配置l7plot-legend__category设置不生效

[Danihay]

https://l7plot.antv.antgroup.com/api/components/legend#legenddomstyles

🐛 Bug description [Please make everyone to understand it]

Please provide a link by forking these links L7Plot or GitHub repo, a minimal reproduction.

• Required Link to minimal reproduction:

📷 Step to reproduce

🏞 Expected result

🚑 Any additional [like screenshots]

• L7Plot Version:
• Platform:

[lvisei]

看了下源码应该是这样写，如果有时间的话，欢迎提 PR 帮忙改下文档

'l7plot-legend l7plot-legend__category'?: CSSProperties

https://github.com/antvis/L7Plot/blob/main/packages/component/src/legend/category/constants.ts