changegroup: always use the treemanifest-enabled version of _packmanifests()
It works for flat manifests too. We just cannot use cg1 or cg2 if we
have subdirectory manifests.
Differential Revision: https://phab.mercurial-scm.org/D4124
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2