[FIX] ir_translation: undo asymmetric change of set_ids/get_ids

Partial revert of commit 39d17c258057ba8ec05b0a2a350c3fb1a1219d3d
of PR #4617, that broke translations by introducing a different
set of criterions for filtering translations in `_set_ids()` and
`_get_ids()`, adding the `module` column in `_set_ids`.

This meant `_get_ids` would see translations that `_set_ids`
would never update: the translation interface did not appear to
be working anymore as soon as a translation entry existed with
no `module` value.
This is likely for manual entries and for entries bootstrapped
by `translate_fields()`, as they do not belong to any module.

The situation described in PR #4617 probably requires an extra
fix in the translation import system instead.

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