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Make dismissable SiteNotices hidden by default so they don't flash

Authored by kaldari.

Description

Make dismissable SiteNotices hidden by default so they don't flash

Note this does not affect the accessibility of the SiteNotices.

Besides T108513, this also fixes the dismiss button jumping from the
top of the notice to the side during page load.

Also, updating a bug number in a comment to the Phabricator ID.

Bug: T108513
Change-Id: I7e5a4bedc30e3bfa32995ad38eaef729cca9c362

Details