fonts: remove fonts.fontDir.enable

As far as I can tell, this isn't required to get fonts to work on
NixOS, so we shouldn't require it on nix-darwin either, even if the
implementations are superficially similar.

modules/fonts/default.nix

@@ -6,28 +6,21 @@ in
 
 {
   imports = [
-    (lib.mkRenamedOptionModule [ "fonts" "enableFontDir" ] [ "fonts" "fontDir" "enable" ])
+    (lib.mkRemovedOptionModule [ "fonts" "enableFontDir" ] "No nix-darwin equivalent to this NixOS option. This is not required to install fonts.")
+    (lib.mkRemovedOptionModule [ "fonts" "fontDir" "enable" ] "No nix-darwin equivalent to this NixOS option. This is not required to install fonts.")
     (lib.mkRemovedOptionModule [ "fonts" "fonts" ] ''
       This option has been renamed to `fonts.packages' for consistency with NixOS.
 
       Note that the implementation now keeps fonts in `/Library/Fonts/Nix Fonts' to allow them to coexist with fonts not managed by nix-darwin; existing fonts will be left directly in `/Library/Fonts' without getting updates and should be manually removed.'')
   ];
 
   options = {
-    fonts.fontDir.enable = lib.mkOption {
-      default = false;
-      description = lib.mdDoc ''
-        Whether to enable font management and install configured fonts to
-        {file}`/Library/Fonts/Nix Fonts`.
-      '';
-    };
-
     fonts.packages = lib.mkOption {
       type = lib.types.listOf lib.types.path;
       default = [ ];
       example = lib.literalExpression "[ pkgs.dejavu_fonts ]";
       description = lib.mdDoc ''
-        List of fonts to install.
+        List of fonts to install into {file}`/Library/Fonts/Nix Fonts`.
       '';
     };
   };
@@ -51,7 +44,7 @@ in
         )
       '';
 
-    system.activationScripts.fonts.text = lib.optionalString cfg.fontDir.enable ''
+    system.activationScripts.fonts.text = ''
       printf >&2 'setting up /Library/Fonts/Nix Fonts...\n'
 
       # rsync uses the mtime + size of files to determine whether they

tests/fonts.nix

@@ -8,7 +8,6 @@ let
 in
 
 {
-  fonts.fontDir.enable = true;
   fonts.packages = [ font ];
 
   test = ''