Fix duplicate branches showing in the Branches tab

Finally fix the duplicate branch problem in the Branches tab.  We
didn't skip past HEAD after we had already showed its symbolic
target name.

Bug: issue 346
Change-Id: I6784bbbc435afc61c3bc05f4f70ccbca2654a251
Signed-off-by: Shawn O. Pearce <sop@google.com>
3 files changed