remotefilelog: use the correct redirection in tests
The test were using '2>%1' which just redirect stderr in the "%1" file. The
intend was '2>&1' which redirect stderr on stdin.
This impact tests because some commit were picking up this '%1' files.
Differential Revision: https://phab.mercurial-scm.org/D7588
#require emacs
$ emacs -q -no-site-file -batch -l $TESTDIR/../contrib/hg-test-mode.el \
> -f ert-run-tests-batch-and-exit
Running 1 tests (*) (glob)
passed 1/1 hg-test-mode--compilation-mode-support
Ran 1 tests, 1 results as expected (*) (glob)