fixed regression body was not included in post message fetch

chatto/src/main/javascript/ts/src/view/ChatView.ts

@@ -158,6 +158,7 @@ export class ChatView implements Observer {
         fetch(JsonAPI.MESSAGE_POST, {
             method: 'POST',
             headers: headers,
+            body: JSON.stringify(chatMessageDTO)
         })
             .then(response => {
                 log.debug(response);