Salsa: Adding back in the instruction field

The "instructions" custom field was accidentally ommited from the
participant's view of an experiment.  This CL just adds it back in

BUG=chromium-os:39736
TEST=Ran on a dev-server and it works

Change-Id: I96f3d15d93c9f023ad767a93aa1ae733115d54f5
Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
1 file changed