tmux-sessionizer: cfg.pkg

I realized I was using the long name for something I already had in
scope

home/modules/tmux-sessionizer.nix

@@ -70,8 +70,6 @@ in
         ${tmux} switch-client -t "$selected_name"
       '');
 
-    home.packages = [
-      config.snowhawk.tmux.sessionizer.pkg
-    ];
+    home.packages = [ cfg.pkg ];
   };
 }