fix json logging

examples/java/json-logging-ecs/oats.yaml

@@ -13,8 +13,7 @@ input:
 expected:
   logs:
     - logql: '{service_name="dice"} |~ `.*simulating an error.*`'
-      equals:
-        - 'Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: simulating an error] with root cause'
+      equals: 'Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: simulating an error] with root cause'
       attributes:
         deployment_environment: staging
         exception_message: "simulating an error"