Fix and update shadow test

This test was not very representative of actual shadow usage so I updated the screenshot to be a more realistic example.

Test: atest LayerTypeAndRenderTypeTransactionTests/LayerTypeAndRenderTypeTransactionTest#SetBoxShadowSettings/1
Bug: 441430291
Flag: EXEMPT bug fix
Change-Id: I789fdd80914627827dc8b2c43fd670c98cb3a6cc