clairvoyant: Add hideUnsupportedVersionBanner option

Clairvoyant v3.1.3 introduced a non-dismissble banner stating that this
version of the app is unsupported, which is shown when the app detects
that it is not running as a Flatpak. This change adds the
"hideUnsupportedVersionBanner" option, disabled by default, which makes
it look like the app is running as a Flatpak.

pkgs/by-name/cl/clairvoyant/package.nix

@@ -8,6 +8,8 @@
 , stdenv
 , vala
 , wrapGAppsHook4
+# Clairvoyant shows a non-dismissable banner recommending the use of the Flatpak version
+, hideUnsupportedVersionBanner ? false
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -34,6 +36,12 @@ stdenv.mkDerivation (finalAttrs: {
     libadwaita
   ];
 
+  preFixup = lib.optionalString hideUnsupportedVersionBanner ''
+    gappsWrapperArgs+=(
+      --set container true
+    )
+  '';
+
   meta = with lib; {
     changelog = "https://github.com/cassidyjames/clairvoyant/releases/tag/${finalAttrs.version}";
     description = "Ask questions and get psychic answers";