_tp_account_manager_account_ready_cb: fix b.fd.o #25051
_tp_account_manager_account_ready_cb: fix b.fd.o #25051

Use tp_g_signal_connect_object to connect signal handlers with a
weakref to manager.

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib