fix: addFilter setFilter parameters

[frenautvh]

previous behavior :

// calling :
addFilter('foo', 'in', [1, 2]);

// results in :
apiOptions.filters = {
  field: 'foo',
  comparator: 'in',
  reference: [ // this is wrong !!!
    [1, 2],
  ],
};

notice that the reference parameter is wrong because we have ...reference in the method declaration function (field, comparator, ...reference) and thus we get a nested array

[frenautvh]

joining already done here for apiv7 : https://github.com/ovh-ux/ng-ovh-api-wrappers/blob/master/src/v7/request-upgrader.service.js#L39