PresenceMixin: expunge g_hash_table_foreach
PresenceMixin: expunge g_hash_table_foreach

I was checking this code out and these scared me.

The one in tp_presence_mixin_set_status is particularly weird because
the callback was only called once because g_hash_table_foreach() only
got called if g_hash_table_size() returned 1!

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