fix(testing): Revert change from #5299.

[joyzhong]

This is suspected to be preventing screenshot tests from running (e.g. #5323).

[patrickrodee]

💯

[codecov-io]

Codecov Report

Merging #5324 into master will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5324      +/-   ##
==========================================
+ Coverage    98.3%   98.57%   +0.26%     
==========================================
  Files         162      162              
  Lines        6311     6311              
  Branches      866      866              
==========================================
+ Hits         6204     6221      +17     
+ Misses        106       89      -17     
  Partials        1        1

Impacted Files	Coverage Δ
packages/mdc-checkbox/component.ts	96.87% <0%> (+1.04%)	⬆️
packages/mdc-tab/component.ts	98.36% <0%> (+3.27%)	⬆️
packages/mdc-base/component.ts	96.66% <0%> (+3.33%)	⬆️
packages/mdc-ripple/component.ts	100% <0%> (+3.77%)	⬆️
packages/mdc-auto-init/index.ts	96% <0%> (+4%)	⬆️
packages/mdc-ripple/util.ts	88.23% <0%> (+5.88%)	⬆️
packages/mdc-switch/component.ts	98.27% <0%> (+6.89%)	⬆️
packages/mdc-radio/component.ts	95.83% <0%> (+8.33%)	⬆️

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[mdc-web-bot]

All 731 screenshot tests passed for commit 0c7c6d8 vs. master! 💯🎉