Avoid the textLayer
becoming visible in high contrast mode (issue 13230)
#14715
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Unfortunately this CSS property is not yet available in Firefox, see https://developer.mozilla.org/en-US/docs/Web/CSS/forced-color-adjust#browser_compatibility which is tracked in https://bugzilla.mozilla.org/show_bug.cgi?id=1591210, however this patch seems to work when testing in Google Chrome.
Given that we really cannot do any more on the PDF.js-side of things, until this CSS feature is actually implemented in Firefox, I figured that submitting this patch cannot hurt in order to get rid of an open issue.