proton-authenticator: fix crash on Wayland

- Set `WEBKIT_DISABLE_COMPOSITING_MODE=1` to prevent WebKitGTK from crashing on Wayland (`Error 71` and `Failed to create GBM buffer`).
- Migrate from manual `wrapProgram` to `gappsWrapperArgs` in `preFixup` to avoid double-wrapping, as `wrapGAppsHook4` is already used in `nativeBuildInputs`.

Closes #501569

pkgs/by-name/pr/proton-authenticator/package.nix

@@ -37,12 +37,16 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     install -Dm755 usr/bin/proton-authenticator $out/bin/${finalAttrs.meta.mainProgram}
     cp -r usr/share $out
 
-    wrapProgram "$out/bin/${finalAttrs.meta.mainProgram}" \
-      --prefix GIO_EXTRA_MODULES : "${glib-networking}/lib/gio/modules"
-
     runHook postInstall
   '';
 
+  preFixup = ''
+    gappsWrapperArgs+=(
+      --prefix GIO_EXTRA_MODULES : "${glib-networking}/lib/gio/modules"
+      --set WEBKIT_DISABLE_COMPOSITING_MODE 1
+    )
+  '';
+
   meta = {
     description = "Two-factor authentication manager with optional sync";
     homepage = "https://proton.me/authenticator";