Motivation for this change

Fixes #78568 . Found this separately and then found a bug report that already existed. This change makes zsh
mirror the bash version of this function in the same file.

Bad behavior:

talos nixpkgs % zsh -i -f -c 'd; echo $?'
zsh:1: command not found: d
127
talos nixpkgs % zsh -i -c 'd; echo $?' 
d: command not found
0

good behavior:

talos ~ % zsh -i -f -c 'd; echo $?' 
zsh:1: command not found: d
127
talos ~ % zsh -i -c 'd; echo $?'    
d: command not found
127
talos ~ % 

Things done

i only really tested by dropping the new function into my local zshrc.

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.