Make electron apps in VMs use wayland

rootfs-nixos/configuration.nix

@@ -487,6 +487,10 @@ in
     perf
     wl-clipboard
   ];
+  environment.variables = {
+    # Without this electron apps default to X11, which doesn't work.
+    ELECTRON_OZONE_PLATFORM_HINT = "wayland";
+  };
 
   # D-Bus for desktop applications
   services.dbus.enable = true;