omarchy-wifi-powersave: nullglob; plocate drop-in daemon-reload; idempotent legacy cleanup

- bin/omarchy-wifi-powersave: shopt -s nullglob. Previously, machines
  with no wireless interfaces ran the loop once with the literal glob
  ('iface=*'), failed iw, and exited 237. With the new always-installed
  udev rule that invokes this on every AC transition, the failure
  would surface as failed transient omarchy-wifi-powersave-* units on
  desktops. Now it cleanly no-ops.
- migrations/1779307845.sh: add 'systemctl daemon-reload' so the
  plocate-updatedb.service.d/ac-only.conf drop-in is picked up on
  upgrade. Arch's systemd pacman hook only triggers on
  /usr/lib/systemd/system/*, not /etc/systemd/system/*.
- install/config/powerprofilesctl-rules.sh and wifi-powersave-rules.sh:
  rm -f the pre-rename legacy paths before udevadm reload, so the
  cleanup is idempotent outside the one-shot migration (matters for
  re-install/downgrade testing).

bin/omarchy-wifi-powersave

@@ -3,6 +3,7 @@
 # omarchy:summary=Set Wi-Fi power save mode on wireless interfaces
 # omarchy:args=<on|off>
 
+shopt -s nullglob
 for iface in /sys/class/net/*/wireless; do
   iface="$(basename "$(dirname "$iface")")"
   iw dev "$iface" set power_save "$1" 2>/dev/null