Remove hard-coded windowBackground to used that of the theme

Bug: 80446342
Test: In head unit
Change-Id: I519af7c0e8c905a7d8f281a9ef29c9525a706acf
2 files changed
tree: aa662411a0ed226b8485e87d032f252babfa1bf7
  1. PREUPLOAD.cfg
  2. library/