fix: ignore within subject when screenshotting the entire runner

[bahmutov]

• Closes cy.within followed by cy.screenshot capture runner does not capture runner #14253

User facing changelog

The combination of cy.within(() => cy.screenshot(name, {capture: 'runner'}) no longer captures the element and instead captures the test runner as expected.

Additional details

We avoid surprising behavior

How has the user experience changed?

Instead of the within element, we get the test runner screenshot

PR Tasks

• Have tests been added/updated?
• Has the original issue or this PR been tagged with a release in ZenHub?

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[cypress]

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Test summary

3955 • 0 • 52 • 1

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Run details

Project	cypress
Status	Passed
Commit	70e4fbd
Started	Dec 23, 2020 5:01 AM
Ended	Dec 23, 2020 5:12 AM
Duration	10:39 💡
OS	Linux Debian - 10.5
Browser	Firefox 77

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[bahmutov]

unrelated failed test