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/etc/calamares/modules/unpackfs.conf

@@ -0,0 +1,7 @@
+---
+# Clone the live squashfs onto the target. Path matches install_dir=tanin,
+# arch=x86_64, airootfs_image_type=squashfs (see profiledef.sh).
+unpack:
+- source: "/run/archiso/bootmnt/tanin/x86_64/airootfs.sfs"
+  sourcefs: "squashfs"
+  destination: ""