Upgrade from version 3.5.0 with PostgreSQL fails

[HirotoKagotani]

Commit e20310e causes a syntax error when upgrading Questionnaire from 3.5.0 or earlier with PostgreSQL.
With PostgreSQL, the UPDATE statement should be:

UPDATE mdl_questionnaire_response qr
SET questionnaireid = qa.qid
FROM mdl_questionnaire_attempts qa
WHERE qr.id = qa.rid;

instead of using INNER JOIN.