narrow: don't wrap exchange.pull() during clone
The wrapped version was setting up the narrow repo requirement when
a narrow clone was requested.
Previous commits taught hg.clone() and repo creation to add the narrow
requirement when a narrow clone was requested. So this requirement
should already be set up for us and this code is no longer necessary.
Differential Revision: https://phab.mercurial-scm.org/D4540
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