Isolate About tests from inherited NO_COLOR

test/shell.d/launch-about-test.sh

@@ -4,6 +4,9 @@ set -euo pipefail
 
 source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
 
+# Start with color enabled; the no-color scenarios opt in below.
+unset NO_COLOR
+
 tmp_dir="$(mktemp -d)"
 trap 'rm -rf "$tmp_dir"' EXIT