fix: remove watcher_id fixme comment as fixed on master

src/modules/sni/watcher.cpp

@@ -33,7 +33,7 @@ void Watcher::busAcquired(const Glib::RefPtr<Gio::DBus::Connection>& conn, Glib:
   if (error != nullptr) {
     // Don't print an error when a watcher is already present
     if (error->code != 2) {
-      spdlog::error("Watcher {}: {}", watcher_id_, error->message); // FIXME: watcher_id_ is neither actually used nor initialized AFAICT
+      spdlog::error("Watcher {}: {}", watcher_id_, error->message);
     }
     g_error_free(error);
     return;