Fix kiwi imports

kiwi.ui.widgets.list was deprecated and is being removed from kiwi. Get it
directly from kiwi.ui.objectlist

Change-Id: I9f6a3a4f30be4128842b19ec6921d301e743f8fc
(cherry picked from commit 08bf143df58691a7e1981d565e57fafb7a8335ed)