astal.cava: unbreak

Required dependency `libcava` was merged to master, so this is no longer
broken.

pkgs/development/libraries/astal/modules/cava.nix

@@ -1,6 +1,13 @@
-{ buildAstalModule }:
+{
+  buildAstalModule,
+  libcava,
+  fftw,
+}:
 buildAstalModule {
   name = "cava";
+  buildInputs = [
+    libcava
+    fftw
+  ];
   meta.description = "Astal module for audio visualization using cava";
-  meta.broken = true; # https://github.com/NixOS/nixpkgs/pull/368312
 }