Fix large clock not changing font size when the screen rotates

Flag: NONE bugfix
Test: manual test, switch between landscape and portrait mode, observe
that large clock changes to correct font size; also observe that full
screen preview of large clock is same with large clock on actual
lockscreen
Bug: 378542029

Change-Id: I75646634172afeaf7c98614ab82ad9efd16b2f9e