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/fstab.conf

@@ -0,0 +1,8 @@
+---
+mountOptions:
+  default:  defaults,noatime
+  btrfs:    defaults,noatime,compress=zstd,space_cache=v2
+  efi:      defaults,noatime,umask=0077
+ssdExtraMountOptions:
+  btrfs:    ssd,discard=async
+crypttabOptions: luks