bug: .gtkrc-2.0 (gtk2) contain spaces and do not load properly

[hervyqa]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

Describe the bug

.gtkrc-2.0 (GTK2) contains spaces so it doesn't load properly.

Steps to reproduce

1. This is my GTK settings for GTK2 and GTK3.

{
  pkgs,
  ...
}: let
  name = "hervyqa";
in {
  home-manager = {
    users.${name} = {
    
      home = {
        packages = with pkgs; [
          lxappearance-gtk2
        ];

      gtk = {
        enable = true;
        font = {
          name = "Roboto";
          size= 8;
        };
        theme = {
          name = "Breeze-Dark";
          package = pkgs.libsForQt5.breeze-gtk;
        };
        iconTheme = {
          name = "Papirus-Dark";
          package = pkgs.papirus-icon-theme;
        };
        cursorTheme = {
          name = "breeze_cursors";
          size = 24;
        };
      };
    };
  };
}

2. open lxappearance-gtk2 (gtk2 apps).
3. logout.

Actual behavior

➜  ~ cat ~/.gtkrc-2.0
gtk-cursor-theme-name = "breeze_cursors"
gtk-cursor-theme-size = 24
gtk-font-name = "Roboto 8"
gtk-icon-theme-name = "Papirus-Dark"
gtk-theme-name = "Breeze-Dark"
➜  ~

GTK3 runs smoothly no problem.

➜  ~ cat ~/.config/gtk-3.0/settings.ini
[Settings]
gtk-cursor-theme-name=breeze_cursors
gtk-cursor-theme-size=24
gtk-font-name=Roboto 8
gtk-icon-theme-name=Papirus-Dark
gtk-theme-name=Breeze-Dark
➜  ~

Expected behavior

No spacing before and after =.

➜  ~ cat ~/.gtkrc-2.0
gtk-cursor-theme-name="breeze_cursors"
gtk-cursor-theme-size=24
gtk-font-name="Roboto 8"
gtk-icon-theme-name="Papirus-Dark"
gtk-theme-name="Breeze-Dark"
➜  ~

Maintainer CC

@JulianFP @rycee

System information

➜  ~ doas nix-channel --list
home-manager https://github.com/nix-community/home-manager/archive/release-23.11.tar.gz
nixos https://nixos.org/channels/nixos-23.11
➜  ~ nix-shell -p nix-info --run 'nix-info -m'
 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.25-rt29, NixOS, 23.11 (Tapir), 23.11.6478.bc194f70731c`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.1`
 - channels(root): `"home-manager-23.11.tar.gz, nixos-23.11"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

➜  ~

[hervyqa]

solved. I haven't changed the xsettingsd settings. services.xsettingsd.settings