fix(autojump): use sh file instead of zsh in NixOS (#11425)

* fix(autojump): fix autojump sourcing in nix (-darwin)

This plugin expects to source an sh/zsh file which sets up autojump, but
that is not done when running Nix on macos using nix-darwin. Looking at
the old value (/etc/profiles/per-user/$USER/bin/autojump), it points to a
binary file instead of the setup script.

* Use zsh file instead of sh

plugins/autojump/autojump.plugin.zsh

@@ -12,7 +12,7 @@ autojump_paths=(
   /opt/local/etc/profile.d/autojump.sh                   # macOS with MacPorts
   /usr/local/etc/profile.d/autojump.sh                   # macOS with Homebrew (default)
   /opt/homebrew/etc/profile.d/autojump.sh                # macOS with Homebrew (default on M1 macs)
-  /etc/profiles/per-user/$USER/bin/autojump          # macOS Nix, Home Manager and flakes
+  /etc/profiles/per-user/$USER/etc/profile.d/autojump.sh # macOS Nix, Home Manager and flakes
 )
 
 for file in $autojump_paths; do