fix: fix warning `Timer '[modern-screenshot] canvas to blob'

[sabereen]

Description

I got following warning in console.

This PR will fix that.

Additional context

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What is the purpose of this pull request?

• [x] Bug fix
• [ ] New Feature
• [ ] Documentation update
• [ ] Other

Before submitting the PR, please make sure you do the following

• [x] Read the Pull Request Guidelines and follow the PR Title Convention.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [x] Ideally, include relevant tests that fail without this PR but pass with it.

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Name	Status	Preview	Comments	Updated (UTC)
modern-screenshot	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 4, 2023 9:50am