iso: fix packages.x86_64 (no inline comments; gstreamer-vaapi -> gst-plugin-va)

Inline comments after a package name broke kitty/flatpak (became invalid
names with trailing whitespace). gstreamer-vaapi was removed from Arch.
calamares is AUR-only -> commented pending a [tanin] rebuild decision.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

iso/build-profile/airootfs/usr/local/bin/tanin-installer

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Launch the Calamares installer fullscreen in a cage kiosk compositor (Wayland,
+# straight on DRM — no display-manager needed in the live session).
+exec cage -s -- calamares