Fix resolution lower issue when setting wallpaper

Now setCurrentWallpaper in ImagePreviewFragment will crop the image size to calculateCropRect size. So adding getScaleOfScreenResolution to get the scale of screen size to scale calculateCropRect

Images from tablet
 -Before: https://screenshot.googleplex.com/7WkUaZdNo8uNBCq.png
          https://screenshot.googleplex.com/3W8X9D7bcvrGoHx.png
 -After: https://screenshot.googleplex.com/XHPPyya7sHaYhKf.png
         https://screenshot.googleplex.com/4dxKJaLqNazqDkF.png

Bug: 206147035
Test: Manual
Change-Id: I64b97a65b75c5f6678a545edc7de74c8a07611af
2 files changed