Remove RLS URI from default RC, add it to assistant_linphone_default_values...
requested to merge fix/prevent_sending_friend_list_subscribe_to_rls_uri_for_non_linphone_accounts into release/6.2
Remove RLS URI from default RC, add it to assistant_linphone_default_values instead + added migration code to remove RLS URI from Core & FriendLists for user who do not have a sip.linphone.org account