Set a max down scale ratio for recommended widgets

If the down scale ratio is smaller than the max down scale ratio,
recommended widgets won't be shown

Bug: 183500375
Test: Rotate to landscape on Pixel 3 and then launch widget picker.
      Recommended widgets are not shown. Rotate to portrait.
      Recommended widgets are shown.
Change-Id: I48b76b23c5bf505c79da82c7b27ea4db85f5d717