fix(upload): apply changeInit correctly

[ph-fritsche]

What:

Closes #667

Why:

init argument was deconstructured incorrectly.
The typing of init.changeInit was incorrect.

Checklist:

• [N/A] Documentation
• Tests
• Ready to be merged

[codesandbox-ci]

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Latest deployment of this branch, based on commit 7495b8a:

Sandbox	Source
userEvent-PR-template	Configuration
user-event upload changeInit example	Issue #667

[codecov]

Codecov Report

Merging #670 (7495b8a) into master (557caaf) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #670   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           50        50           
  Lines          930       930           
  Branches       366       366           
=========================================
  Hits           930       930           

Impacted Files	Coverage Δ
src/upload.ts	100.00% <ø> (ø)

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[github-actions]

🎉 This PR is included in version 13.1.7 🎉

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