[GrabToPan] Use `Element.matches()` rather than prefixed `...matchesSelector` versions
[GrabToPan] Use `Element.matches()` rather than prefixed `...matchesSelector` versions

At this point in time all of the browsers that PDF.js support now implements, with some margin based on the version numbers, `Element.matches()` according to the following compatibility information:
 - https://developer.mozilla.org/en-US/docs/Web/API/Element/matches#browser_compatibility
 - https://caniuse.com/matchesselector

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