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contrib: fix import-checker to operate on str instead of bytes

Authored by durin42.

Description

contrib: fix import-checker to operate on str instead of bytes

I believe this is fallout from other Python 3 cleanups, and our code
linting tools are now leaning towards operating on str and not
bytes. I don't feel strongly, so I've just restored this tool to
working on Python 3.

Differential Revision: https://phab.mercurial-scm.org/D6453