changeset_templater: do not enable verbosity postfix for [templates] section
Since this postfix hack exists only for backward compatibility, we don't need
it for new [templates] section. This isn't a BC as templates defined in
[templates] section weren't loaded until recently.
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https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
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273ce12ad8f1` will report some style violations on a very old commit).