configurator: pacstrap omarchy + omarchy-installer (not just installer)

With the cleaner dep graph, omarchy-installer no longer transitively
pulls omarchy + omarchy-settings + omarchy-limine. Pacstrap both
explicitly so /etc/skel (via omarchy -> omarchy-settings) is populated
before archinstall creates the user.

configs/airootfs/root/configurator

@@ -479,7 +479,7 @@ cat <<-_EOF_ >user_configuration.json
         "base-devel",
         "git",
         "omarchy-keyring",
-        "snapper",
+        "omarchy",
         "omarchy-installer"
     ],
     "profile_config": {