Add second eventsource/format-field-retry-bogus.any.js test with diff…

[cdumez]

…erent timeouts

Add second eventsource/format-field-retry-bogus.any.js test with different timeouts to better validate the WebKit / Blink implementation. WebKit and Blink have a concept of defaultReconnectDelay which is 3 seconds so it is useful to use another delay value in the test to check if we fell back to using the default delay or not when parsing failed.