Fix for sending synthesized-audio verb:status event when using TTS streaming (#1366)

https://github.com/jambonz/jambonz-feature-server/issues/1365

lib/tasks/tts-task.js

@@ -327,6 +327,13 @@ class TtsTask extends Task {
             this.playbackIds.push(extractPlaybackId(filePath));
             this.logger.debug({playbackIds: this.playbackIds}, 'Say: a streaming tts api will be used');
             const modifiedPath = filePath.replace('say:{', `say:{session-uuid=${ep.uuid},`);
+            this.notifyStatus({
+              event: 'synthesized-audio',
+              vendor,
+              language,
+              servedFromCache,
+              'id': this.id
+            });
             return modifiedPath;
           }
           return filePath;