-error: when you switch the primary mouse button in the system setting the new Input System doesn't recognize that

-repro:
--create new project
--add uGUI button to the sample scene
--switch your primary mouse button to right button in system settings
--play scene
--click the ugui button with your right mouse button
--notice it gets pressed
--install input package
--switch to the Input system for input handling and add the Input System UI Input Module to the EventSystem in the sample scene
--play scene again
--click the ugui button with the right mouse button
--NOTICE it doesn't get clicked with the right mouse button but works with the left one

reproducible with 2019.3.10, 2020.1b6, 2020.2a5
not reproducible on OSX