internal.setPersistent sets `remember` field instead of `logged_in` field to indicate user wants a silent assertion.

In  `resources/static/test/cases/dialog/js/misc/internal_api.js` and `resources/static/dialog/js/misc/internal_api.js` , internal.setPersistent sets `remember` field instead of `logged_in` field to indicate user wants a silent assertion.

This means users signing in using internal API are not getting the full goodness of silent assertions.

So we should replace 'remember' field with 'logged_in' field.

internal.setPersistent function is defined in `resources/static/dialog/js/misc/internal_api.js`.

Fixes Issue #3856.