app: make "gegl:matting-levin" default engine of Foreground Select tool.
Even though this engine is optional, we already have the code to detect its absence at runtime, and to fallback to "gegl:matting-global". So it won't be a problem even then. When the operation is present though, it definitely makes a lot more sense than matting global as default, because it performs a lot better in most cases (as far as I could see as well as others).
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