return FIXTURE_VERSION to what it was originally

this will be broken until pantheon-systems/infrastructure#3574 is merged, but then we can re-run and it should work

bin/validate-fixture-version.sh

@@ -31,8 +31,7 @@ main(){
     TESTED_UP_TO=$(grep -i "Tested up to:" "${README_FILE_PATH}" | tr -d '\r\n' | awk -F ': ' '{ print $2 }')
     echo "Tested Up To: ${TESTED_UP_TO}"
     local FIXTURE_VERSION
-    # Ignore NewRelic error.
-    FIXTURE_VERSION=$(terminus wp "${TERMINUS_SITE}.dev" -- core version 2>&1 | grep -v "PHP Startup: Unable to load dynamic library" | awk '/^[0-9]+\.[0-9]+(\.[0-9]+)?$/ {print $0; exit}')
+    FIXTURE_VERSION=$(terminus wp "${TERMINUS_SITE}.dev" -- core version)
     echo "Fixture Version: ${FIXTURE_VERSION}"
 
     if ! php -r "exit(version_compare('${TESTED_UP_TO}', '${FIXTURE_VERSION}'));"; then