Fix enter with completion in add reviewer box

If the user presses enter while the completion list is open and a
row is highlighted, allow the suggestion box to consume the enter
event and fire the selection handler.  This is necessary to fill
in the completed value before we submit the action to the server.

Bug: issue 481
Change-Id: Ie5fc423dc21f12d93f7ec185596e4d884b8a18dc
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed