tests: Tweak red in nv_copy_image-simple
Change red to something less than 1.0 in order to demonstrate a fast-clear bug in i965 and iris. Pre-ICL platforms do not fail with this change, but ICL+ fails with:
$ ./bin/nv_copy_image-simple --tex-to-tex -auto -fbo
Probe color at (16,8)
Expected: 127 0 0
Observed: 255 0 0
Probe color at (16,11)
Expected: 127 0 0
Observed: 255 0 0
Probe color at (49,11)
Expected: 127 0 0
Observed: 255 0 0
Probe color at (16,43)
Expected: 127 0 0
Observed: 255 0 0