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localrepo: don't use defaults arguments that will never be overridden

The commithook() callback will be called when the lock is
released. lock.release() calls the callback without arguments, so it
was quite confusing to me that this function declared extra
arguments. We can just close on the variables in the outer scope
instead.

Differential Revision: https://phab.mercurial-scm.org/D6336

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