fix(modal): style scope error, fix mask do not disappear

[LEEHONCN]

将 fade 的这些动画样式 移到 gio-modal-mask 作用域下 ，原来是 .gio-modal.fade-enter

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/growingio/gio-design/6PLPEraN5XobW5Kiiecbu4GtxVLc
✅ Preview: https://gio-design-git-modal-fix-growingio.vercel.app

[codecov]

Codecov Report

Merging #863 (a112155) into master (b4d0e47) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #863   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files         151      151           
  Lines        4893     4893           
  Branches     1304     1304           
=======================================
  Hits         4654     4654           
  Misses        235      235           
  Partials        4        4           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b4d0e47...e72e36a. Read the comment docs.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication