[jest-editor-support] update definition

[stephtr]

According to the implementation the first parameter of Snapshot constructor is optional.
#trivial

[codecov-io]

Codecov Report

Merging #6212 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6212   +/-   ##
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  Coverage   64.37%   64.37%           
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  Files         219      219           
  Lines        8453     8453           
  Branches        4        4           
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  Hits         5442     5442           
  Misses       3010     3010           
  Partials        1        1

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[SimenB]

@orta thoughts? I think it makes sense, but what do I know? 😀

[orta]

Yeah, look like it handles undefined correctly 👍

https://github.com/facebook/jest/blob/f4f51914d577dc53748f599f3f626dfe3154883e/packages/jest-editor-support/src/Snapshot.js#L105-L106

[github-actions]

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