View Note: removes the ability to make multiple notes for the same call.

You could take multiple notes for the same call while the
ModButtonPresenter was visible.  This resolves that so users
will be taken to view the previously existing note, rather
than try create a new one again.

NOTES-114, NOTES-22

Change-Id: I250ffd4c0092f4ea438dc642ba0bb376df8fbaa6
(cherry picked from commit 00ddbb64)