make AlphaMask constructors explicit
to reduce surprises in some changes I'm planning Change-Id: I61cb58d51ab77f57e55159017c7bece5bd99953f Reviewed-on: https://gerrit.libreoffice.org/54161Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
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