ListBuilds: Fix legacy channel URLs.

Regression introduced by 1fdc258de0d7f97af428de34e8be019fca3db251.

The commit introduced a channel/custom PathPart which uses the new custom channel expressions, but I forgot to remove CaptureArgs, so the URL really is channel/latest/ignored-value.

Signed-off-by: aszlig <aszlig@redmoonstudios.org> Reported-by: Peter Simons <simons@cryp.to>

Created by  aszlig  on October 31, 2015
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