Enable Ozone for chromium-based apps

oscar/configuration.nix

@@ -106,6 +106,8 @@
   # Enable touchpad support (enabled default in most desktopManager).
   # services.xserver.libinput.enable = true;
 
+  environment.sessionVariables.NIXOS_OZONE_WL = "1";
+
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.chandler.isNormalUser = true;
   users.users.chandler.description = "Chandler Swift";