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/services-systemd.conf

@@ -0,0 +1,13 @@
+---
+services:
+- name: greetd            # the TANINUX login (tanin-greet) — its config is already
+  mandatory: false        #   in place from the tanin-greet package scriptlet
+- name: NetworkManager
+  mandatory: false
+- name: snapper-cleanup.timer
+  mandatory: false
+- name: snapper-timeline.timer
+  mandatory: false
+targets:
+- name: graphical
+  mandatory: true