core/manager: restore bus track deserialization cleanup in manager_re…

…load()

There's zero explanation why it got (spuriously) removed in
8402ca04d1a063c3d8a9e3d5c16df8bb8778ae98...

(cherry picked from commit 34f4b817f67b002eae7e2c09b19bf4b66c4791b6)

Resolves: RHEL-73780

src/core/manager.c

@@ -3805,6 +3805,11 @@ int manager_reload(Manager *m) {
         (void) manager_setup_handoff_timestamp_fd(m);
         (void) manager_setup_pidref_transport_fd(m);
 
+        /* Clean up deserialized bus track information. They're never consumed during reload (as opposed to
+         * reexec) since we do not disconnect from the bus. */
+        m->subscribed_as_strv = strv_free(m->subscribed_as_strv);
+        m->deserialized_bus_id = SD_ID128_NULL;
+
         /* Third, fire things up! */
         manager_coldplug(m);