The image is burned into the LCD and would need to be replaced. Unfortunately the part is not available through iFixit yet, so here is a link to [http://gadgetfix.com/category/motorola-moto-g4-plus-lte-1584.html|where you can get it]. Please double check the model number on the back and select the proper one for your phone.
Here is a good video on [https://www.youtube.com/watch?v=1ki33UIfqhE|how to get the repair done].
Good luck and keep us posted.