fix(omz): replace initBeforeCompInit due to deprication

modules/home-manager/shell.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, inputs, ... }:
+{ config, lib, pkgs, inputs, ... }:
  
 {
   # configure z-shell to use omz with some plugins
@@ -13,7 +13,7 @@
       plugins = [ "git" "ssh-agent" "gpg-agent" ];
     };
     # only display a fancy theme when glyphs are rendered
-    initExtraBeforeCompInit = ''
+    initContent = lib.mkOrder 550 ''
       if [[ "$TERM" == "linux" || "$TERM" == "screen" ]]; then
         ZSH_THEME="gentoo"
       else