Fix crash when rendering pending widget preview

- The pending widget disabled icon drawable is created from the icon backed
  by a hw bitmap, and when a user long presses the widget, we attempt to
  draw the drawable using a canvas backed by a software bitmap.

Bug: 112324288
Test: Pick up a pending app widget
Change-Id: Ied49112a2b03d54691f6db7c65e9267c8bd8e91f