fix(comp:collapse,empty): margin size css var reference error

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

margin 的 css 变量引用错误，引用了不存在的css变量

What is the new behavior?

修复以上问题

Other information

[idux-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.79%. Comparing base (49eb4ea) to head (bc32eb9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1872   +/-   ##
=======================================
  Coverage   90.79%   90.79%           
=======================================
  Files         359      359           
  Lines       35225    35225           
  Branches     2805     2805           
=======================================
  Hits        31981    31981           
  Misses       3244     3244           

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