ci: Clean up some excessive use of pipes in dEQP results processing.

Given that we use set -x in the script, this actually makes the user
experience of viewing logs nicer.

Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4621>
1 file changed