fix openbsd color-display problem in system test output

10 jobs for 245-fix-test-color in 8 minutes and 52 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Precheck
passed precheck:debian:sid:amd64 #14618
amd64 docker linux

00:00:11

 
  Build
passed build:clang:debian:sid:amd64 #14619
amd64 docker linux

00:02:55

passed build:clang:debian:sid:i386 #14621
i386 docker linux

00:03:14

passed build:debian:sid:amd64 #14620
amd64 docker linux

00:01:45

passed build:debian:sid:i386 #14622
i386 docker linux

00:01:49

 
  Test
passed systemtest:debian:sid:amd64 #14626
amd64 docker linux

00:05:05

passed systemtest:debian:sid:i386 #14627
i386 docker linux

00:05:26

passed unittest:clang:debian:sid:amd64 #14624
amd64 docker linux

00:04:09

passed unittest:debian:sid:amd64 #14623
amd64 docker linux

00:04:09

passed unittest:debian:sid:i386 #14625
linux i386 docker

00:04:09