fix: always set default external stream handler (#99)

The default redirect handler should always be setup, as it is a fallback for manifest load error.
If forceRedirectExternalStreams it means application wants it to be utilized in advanced, even before an error occurred.

src/common/utils/external-stream-redirect-helper.js

@@ -39,10 +39,8 @@ function configureExternalStreamRedirect(config: Object): void {
     });
     sourceOptions = config.sources.options;
   }
-  if (sourceOptions.forceRedirectExternalStreams) {
-    if (typeof sourceOptions.redirectExternalStreamsHandler !== "function") {
+  if (typeof sourceOptions.redirectExternalStreamsHandler !== "function") {
       sourceOptions.redirectExternalStreamsHandler = getDirectManifestUri;
-    }
   }
 }