Fix wrong oiio:UnassociatedAlpha metadata for PSD files #3750
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Description
Refactoring in #1641 incorrectly caused this to be set on the last layer rather than the composite image as before. Now set it on the composite image and every layer, as all of them use unassociated alpha.
Tests
Test was added.
Checklist:
have previously submitted a Contributor License Agreement
(individual, and if there is any way my
employers might think my programming belongs to them, then also
corporate).
(adding new test cases if necessary).