Apply keydown instead of keyup in sitelinkview toolbar definition

keydown event propagation is stopped in the suggester widget when native suggester handling is
triggered. On any native suggester handling (closing the menu, selecting a suggestion), no
additional action (e.g. saving, canceling) is supposed to be triggered.
requires: https://github.com/wmde/ValueView/pull/115

Change-Id: Id701776188b4e4d9fb4373b7b77f2abd6c62c320
Merge "Apply keydown instead of keyup in sitelinkview toolbar definition"