[BD-46] fix: tablefooter design differences

[khudym]

Description

Fixed difference with design
Issue2904

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (944ca29) 93.00% compared to head (cd2332b) 93.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2969   +/-   ##
=======================================
  Coverage   93.00%   93.00%           
=======================================
  Files         236      236           
  Lines        4273     4273           
  Branches     1033     1033           
=======================================
  Hits         3974     3974           
  Misses        295      295           
  Partials        4        4           

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[PKulkoRaccoonGang]

@khudym, Let's fix the upper-bound problem. In the issue, I provided a screenshot with a strange top border. Let's change it according to the component design.
I'm guessing that changing the $data-table-border variable to 2px solid $light-300 should give users the correct display of the component.

Please add a link to the deployment preview of the component in the description 💯

[openedx-semantic-release-bot]

🎉 This PR is included in version 21.12.3 🎉

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