fix(legend): 修复 legend radio 设置样式不生效

[visiky]

close: #3783

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

[github-actions]

🎊 PR Preview fe55499 has been successfully built and deployed to https://antvis-G2-preview-pr-3784.surge.sh?type=diff&date=2022-01-18

🕐 Build time: 60.121s

_{🤖 By Surge Ui Insight}

[coveralls]

Pull Request Test Coverage Report for Build 1710405303

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 93.483%

---

Files with Coverage Reduction	New Missed Lines	%
src/chart/controller/gesture.ts	7	82.14%

Totals
Change from base Build 1697579167:	-0.05%
Covered Lines:	11571
Relevant Lines:	12000

---

💛 - Coveralls