Remove redundant zsh enable flag

Author: jeremystucki

common/nixos.nix

@@ -26,7 +26,6 @@
     ];
   };
 
-  programs.zsh.enable = true;
   users.defaultUserShell = pkgs.zsh;
 
   networking = {

darwin-configuration.nix

@@ -17,7 +17,6 @@
   ids.gids.nixbld = 350;
 
   environment.shells = [pkgs.zsh];
-  programs.zsh.enable = true;
 
   services.tailscale.enable = true;