Fix layout problem in "All apps" view

Fix layout problem which prevents the user from
scrolling to the last list item in the "all apps"
view when the spinner ("all apps", "installed apps"
,"disable apps") is present.

Bug: 199476116
Test: 1. Enter Settings -> All apps
      2. Disable any app
      3. Scroll to the end of the app list

      The last item (e.g. YouTube) should not be visible
      underneath the navigation bar.

Change-Id: I1c29fd979697316e48460e466c33f202dcf6a8f4