Tweak the filter parameters so that we now use any restored wallpaper image
that is larger than our ideal size, and will reject any smaller images only
if they are *much* smaller than our ideal size. The specific threshold used
here will just barely reject Nexus One or Droid sized wallpapers for restore
onto a Xoom, but will pass anything larger.
Bug 4070129
Change-Id: I889bdb3ef5011343b2fccb2f81c6abc2f4603ee2