Restart the shell unconditionally after every update

Updates routinely replace the shell's QML, and a stale process can
lazy-load new files into old code. Restarting at the end of every
omarchy update removes the need for migrations to restart the shell
or defer one with the restart-shell-required marker: the login-time
migration path already runs a fresh shell that hot-reloads shell.json.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

migrations/1784672586.sh

@@ -5,5 +5,4 @@ if ! omarchy-pkg-present quickshell-git; then
   # quickshell package in place; packages depending on quickshell stay
   # satisfied through the provides.
   sudo pacman -S --noconfirm --ask 4 quickshell-git
-  omarchy-state set restart-shell-required
 fi