fix(comp:table): change filterable dropdown footer button size to xs

[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?

筛选下拉选择确定按钮尺寸为 'sm'

What is the new behavior?

修改为 ‘xs’

Other information

视觉检视

[idux-bot]

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[codecov]

Codecov Report

Merging #1218 (51bb012) into next (34b2d70) will not change coverage.
The diff coverage is n/a.

❗ Current head 51bb012 differs from pull request most recent head a7c7727. Consider uploading reports for the commit a7c7727 to get more accurate results

@@           Coverage Diff           @@
##             next    #1218   +/-   ##
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  Coverage   92.66%   92.66%           
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  Files         316      316           
  Lines       29036    29036           
  Branches     3259     3259           
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  Hits        26905    26905           
  Misses       2131     2131           

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