Dominik Schilling d43d1503f7 Customize Headers: Improve handling of the initial header model.
Headers are currently keyed by the basename of the image, see #31786. When two images have the same key only one image will be listed and the current image can be empty in the header control.
To prevent this we now fall back to the raw current header image if the image isn't in `_wpCustomizeHeader.uploads`.

props sirbrillig.
fixes #31742.
Built from https://develop.svn.wordpress.org/trunk@32091


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