treewide: zsh initExtraBeforeCompInit -> initContent

Migrating in tree usages of zsh initExtraBeforeCompInit to initContent
before deprecating, matching priority of current option.

modules/programs/antidote.nix

@@ -31,12 +31,12 @@ in {
 
   config = mkIf cfg.enable {
     home.packages = [ cfg.package ];
-    programs.zsh.initExtraBeforeCompInit = let
+    programs.zsh.initContent = let
       configFiles = pkgs.runCommand "hm_antidote-files" { } ''
         echo "${zPluginStr cfg.plugins}" > $out
       '';
       hashId = parseHashId "${configFiles}";
-    in ''
+    in (mkOrder 550 ''
       ## home-manager/antidote begin :
       source ${cfg.package}/share/antidote/antidote.zsh
       ${optionalString cfg.useFriendlyNames
@@ -50,6 +50,6 @@ in {
       antidote load $bundlefile $staticfile
 
       ## home-manager/antidote end
-    '';
+    '');
   };
 }

modules/programs/dircolors.nix

@@ -207,9 +207,9 @@ in {
       '';
 
       # Set `LS_COLORS` before Oh My Zsh and `initExtra`.
-      programs.zsh.initExtraBeforeCompInit = mkIf cfg.enableZshIntegration ''
+      programs.zsh.initContent = mkIf cfg.enableZshIntegration (mkOrder 550 ''
         eval $(${pkgs.coreutils}/bin/dircolors -b ${dircolorsPath})
-      '';
+      '');
     }
     (mkIf (!config.home.preferXdgDirectories) {
       home.file.".dir_colors".text = dircolorsConfig;

modules/programs/zplug.nix

@@ -44,7 +44,7 @@ in {
   config = mkIf cfg.enable {
     home.packages = [ pkgs.zplug ];
 
-    programs.zsh.initExtraBeforeCompInit = ''
+    programs.zsh.initContent = mkOrder 550 ''
       export ZPLUG_HOME=${cfg.zplugHome}
 
       source ${pkgs.zplug}/share/zplug/init.zsh