Confirm External Storage: adjust the notification message

We need to forward the information that the folder is an external storage
for the notification message.

Issue: https://github.com/owncloud/client/pull/5340#issuecomment-274878023

src/libsync/syncengine.cpp

@@ -835,8 +835,8 @@ void SyncEngine::startSync()
     connect(discoveryJob, SIGNAL(folderDiscovered(bool,QString)),
             this, SIGNAL(folderDiscovered(bool,QString)));
 
-    connect(discoveryJob, SIGNAL(newBigFolder(QString)),
-            this, SIGNAL(newBigFolder(QString)));
+    connect(discoveryJob, SIGNAL(newBigFolder(QString,bool)),
+            this, SIGNAL(newBigFolder(QString,bool)));
 
 
     // This is used for the DiscoveryJob to be able to request the main thread/