cerbero: Switch default buildtype from debug to debugoptimized

Nirbheek Chauhan requested to merge nirbheek/cerbero:meson-buildtype into master

debug doesn't enable any optimizations and leads to very slow code. This is rather suboptimal for a multimedia framework.

Also, variants.debug || variants.nodebug is always True, so the code that set the buildtype was always wrong.

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