fix test

Author: mydea

dev-packages/node-integration-tests/suites/tracing/envelope-header/error-active-span-unsampled/test.ts

@@ -14,6 +14,7 @@ test('envelope header for error event during active unsampled span is correct',
           sample_rate: '0',
           sampled: 'false',
           sample_rand: expect.any(String),
+          transaction: 'test span'
         },
       },
     })