fix config merging

lib/tasks/cognigy/speech-config.js

@@ -23,8 +23,8 @@ class SpeechConfig extends Emitter {
       this.sessionConfig,
       changedConfig,
       (objValue, sourceValue) => {
-        if (isArray(objValue)) {
-          if (isArray(sourceValue)) {
+        if (Array.isArray(objValue)) {
+          if (Array.isArray(sourceValue)) {
             return sourceValue;
           }
           return objValue;