lxterminal: No GSettings schemas are installed on the system

[OPNA2608]

Issue description

Running lxterminal in AwesomeWM (perhaps just any WM, without a DE) and attempting to open the Color Chooser window in settings crashes all running instances of lxterminal with the message from the issue title:

(lxterminal:29942): GLib-GIO-Error **: 11:44:45:567: No GSettings schemas are installed on the system
Trace/breakpoint trap

This error did not occur while using the MATE DE. I'm certain it needs to be wrapped with wrapGAppsHook.

Steps to reproduce

• start an AwesomeWM session (or perhaps any other WM-only session)
• lxterminal-> Settings
• clicking on any colour button now will crash lxterminal. checking journalctl or starting it from another terminal program will reveal the quoted error message

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

• system: "x86_64-linux"
• host os: Linux 4.18.12, NixOS, 18.09.892.c06f5302f63 (Jellyfish)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.1.1
• channels(bt1cn): ""
• channels(root): "nixos-18.09.892.c06f5302f63"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

[jtojnar]

Yes, wrapping with wrapGAppsHook is the correct solution.