testUpgradeInstanceWithOldDataFs: enable erp5-bin bt repository

Since c4026c75 (erp5_officejs: change Notebook app editor from
iodide_master to gadget_jsmd_eval, 2020-09-23), erp5_officejs depends on
erp5_notebook, but erp5_notebook is not present in erp5 repository, it is
in erp5-bin repository.

This test works by taking an old Data.fs and running upgrader, to update
to latest code. The first thing it does is using
setupAutomaticBusinessTemplateRepository to discover folder containing
business templates repositories and enabling them. Until now it was doing
only for erp5_core (to find parts/erp5/product/ERP5/bootstrap) and for
erp5_base (to find parts/erp5/bt5/). Now we also need to do that for
erp5_notebook, to find parts/erp5-bin/bt5/