Adjust test data for EDID test

Device ID is computed is the most unambiguous way possible, tests' expectations were wrong.

That's it. Other tests are more or less useless or hard to fix, as they are platform dependent: wayland tests would crash under X11 session, and xrandr test basically just compares real-world state to a hardcoded set of data points — which is hardly useful for anyone except original author and their setup.