Fix file path in call to `clean_file`

Description

The call to `i18n_tool transifex --pull` fails during the call to the
`clean_translated_locales` function because the path to the *.po files
is incorrect. In `dirname.files('*.po')`, the result already includes
the path relative to the `dirname`, so it is incorrect to perform an
additional `joinpath`.

Assignee

Ned Batchelder

Reporter

Open Source Pull Request Bot

Labels

None

Contributor Name

Régis Behmo

Repo

edx/i18n-tools

Customer

None

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

Site Delivery & Infrastructure

Platform Map Area (Levels 3 & 4)

None

Priority

Unset
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