ci/deqp: backport fix for dEQP-EGL.functional.wide_color.*_888_colorspace_*

Fix from @jannau in https://github.com/KhronosGroup/VK-GL-CTS/pull/405, landed as https://github.com/KhronosGroup/VK-GL-CTS/commit/dacf752adf388ce4399733ee9b4a3c8a4f317990 but isn't in a release yet; let's backport so that we can see the real failures instead...

Speaking of which, lima still fails the wide_color tests so it has an actual bug, but all the other drivers are fixed so it was just a bad test.