haskellPackages.synthesizer-alsa: re-enabled

Closes #146475.

Co-authored-by: sternenseemann <[e-mail]>

pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml

···
   - syntax-trees
   - syntax-trees-fork-bairyn
   - synthesizer
-  - synthesizer-alsa
   - Sysmon
   - sys-process
   - system-canonicalpath

pkgs/development/haskell-modules/hackage-packages.nix

···
        platforms = [
          "aarch64-linux" "armv7l-linux" "i686-linux" "x86_64-linux"
        ];
-       hydraPlatforms = lib.platforms.none;
-       broken = true;
      }) {};
 
   "synthesizer-core" = callPackage