subrepo: fix test breakage introduced in 2b34d004e644
The test didn't break when I originally committed it (git version
1.7.12.4 (Apple Git-37)), and still doesn't on that machine, but the
output changes elsewhere with "Warning: you are leaving N commits
behind..."
This change sets a ref on the commit we're updating the subrepo _away_
from to quash the warning.
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