Setting the Zoom parameter for the image widget is no longer required to be able to use the background parameter. This has been done to accomodate changes required for Task#2296173 as setting the zoom value to false was preventing proper display of the employee image. closes odoo/odoo#55966 Related: odoo/enterprise#12437 Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>