Tests: fix test_auth_data_insert_parameters()
Tests: fix test_auth_data_insert_parameters()

The test was incorrectly assuming the sorting order of the
AgAccountServices returned by ag_manager_get_account_services().

To correct this, instantiate the AgAccountManager for a specific service
type, and then we know that only one account service will be returned.

plotters/accounts-sso.libaccounts-glib,plotters/accounts-sso.libaccounts-glib,plotters/accounts-sso.libaccounts-glib