Revert "Update run-tests script"

This reverts commit bb6b1ebf.

run-tests.sh

@@ -4,7 +4,7 @@ set -e
 if [ "$1" = "macos" ]; then
 
   echo "\n\033[1;32m▶ Running package tests on macOS...\033[0m"
-  swift test 2>&1 | ./xcbeautify
+  set -o pipefail && swift test 2>&1 | ./xcbeautify
 
 elif [ "$1" = "ios" ]; then