pager: wrap _runcommand() no matter if stdout is redirected
We've made chg utilize the common code path implemented in pager.py (by
815e1cefd082 and 493935e0327a), but the chg server does not always start
with a tty. Because of this, uisetup() of the pager extension could be
skipped on the chg server.
Kudos given to Sean Farley for dogfooding new chg and spotting this problem.
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