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templater: teach template loader to use open_template() function

Authored by martinvonz.

Description

templater: teach template loader to use open_template() function

The template loader can apparently load templates from relative paths,
so I needed to add that support to open_template().

This takes the number of failing tests with PyOxidizer from 54 to 34.

Differential Revision: https://phab.mercurial-scm.org/D8907