Generic EventSource does not set payload when jsonBody is not true

[whynowy]

Describe the bug

If jsonBody is not true, payload from the GRPC server is ignored.

					eventData := &events.GenericEventData{
						Metadata: el.GenericEventSource.Metadata,
					}
					if el.GenericEventSource.JSONBody {
						eventData.Body = (*json.RawMessage)(&event.Payload)
					}
					eventBytes, err := json.Marshal(eventData)

To Reproduce
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4. See error

Expected behavior
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Screenshots
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Environment (please complete the following information):

• Kubernetes: [e.g. v1.18.6]
• Argo: [e.g. v2.9.4]
• Argo Events: [e.g. v1.0.0]

Additional context
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