installation/nextcloud_itopie.md: [pgsql] use Ansible script
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This complements 9a953fe23f4de281b2f60a1c7a6445ebaf47fa90 and 0c93d3592f51311568a067bddf207692e9d745ce, and fixes <https://odoo.itopie.ch/web#id=281&active_id=281&model=project.task&view_type=form&cids=1&menu_id=323> and <mid:779E094E-EFFD-4ABB-9563-425DCDE7DD69@itopie.ch>. Thanks to Jonathan Blum <jblum@itopie.ch> for the help.