[Gecko Bug 1956453] Simplify how we suppress the canvas background color. #51669
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Instead of conditionally inserting the item at the bottom of the
BorderBackground() list, just suppress its color.
Differential Revision: https://phabricator.services.mozilla.com/D243317
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1956453
gecko-commit: d1cbe9636c3a2c8034db1e6e5abd0bd9def37a57
gecko-reviewers: mstange