fix: correct the clang-format example hgrc so that it actually works
There are three changes here:
* Remove -i from `command`, it causes fix to eat your file and empty it out
* Add `set:` to pattern, otherwise this is interpreted as just a glob
* Switch `listfile:` to `include:`; `listfile:` is relative to the current
working directory, while `include:` is relative to the repo root. This makes
it so that you don't receive errors when running outside of the repo root
about being unable to find the file.
Differential Revision: https://phab.mercurial-scm.org/D7618
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