test(module:image): revert test change

[ParsaArvanehPA]

PR Checklist

Please check if your PR fulfills the following requirements:

• [✔] The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• [✔] Tests for the changes have been added (for bug fixes / features)
• [] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Application (the showcase website) / infrastructure changes
• [✔] Other... Please describe: tests

What is the current behavior?

Reverting the change made in #8766, due to

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• [✔] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.15%. Comparing base (dd42ad9) to head (f63c190).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8779   +/-   ##
=======================================
  Coverage   93.15%   93.15%           
=======================================
  Files         538      538           
  Lines       18457    18457           
  Branches     2816     2816           
=======================================
+ Hits        17193    17194    +1     
+ Misses       1226     1225    -1     
  Partials       38       38           

Flag	Coverage Δ
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