fix(layout): root-entry-name variable error

[PeachScript]

Description

更新 style/index.less 中引入 antd 默认主题变量的方式，避免报错：

Compile Error ：“Variable @root-entry-name is undefined”

ref: https://github.com/ant-design/ant-design/issues/33853

[codecov[bot]]

Codecov Report

Merging #862 (4eee3ee) into master (b3a05ee) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #862   +/-   ##
=======================================
  Coverage   44.95%   44.95%           
=======================================
  Files          67       67           
  Lines        1706     1706           
  Branches      452      465   +13     
=======================================
  Hits          767      767           
+ Misses        937      930    -7     
- Partials        2        9    +7     

Impacted Files	Coverage Δ
packages/plugin-locale/src/index.ts	82.19% <0.00%> (ø)
packages/plugin-qiankun/src/common.ts	60.52% <0.00%> (ø)
packages/plugin-ant-design-pro-block/src/index.ts	0.00% <0.00%> (ø)
packages/plugin-qiankun/src/master/modifyRoutes.ts	0.00% <0.00%> (ø)

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[afc163]

@zombieJ 看看吧，理论上不应该还有这个问题了。

[zombieJ]

这里引用的不对： https://github.com/umijs/plugins/blob/a3ddea6730d827f8ba94387a8b1779481df7d0c5/packages/plugin-layout/src/layout/style.less#L1

应该直接引用 antd/dist/antd.variable.less or antd/dist/antd.less ，dist 里的 less 都是包过的。直接引用内部的 less 文件才会报这个错。

[PeachScript]

这里引用的不对：

https://github.com/umijs/plugins/blob/a3ddea6730d827f8ba94387a8b1779481df7d0c5/packages/plugin-layout/src/layout/style.less#L1

应该直接引用 antd/dist/antd.variable.less or antd/dist/antd.less ，dist 里的 less 都是包过的。直接引用内部的 less 文件才会报这个错。

已更新成 antd/dist/antd.less ❤️