Trigger media scan after file upload

After a successful upload, the uploaded file is saved locally on the
device but the media scan was not getting triggered.

src/com/owncloud/android/files/services/FileUploader.java

@@ -727,6 +727,7 @@ public class FileUploader extends Service
         }
         file.setNeedsUpdateThumbnail(true);
         mStorageManager.saveFile(file);
+        mStorageManager.triggerMediaScan(file.getStoragePath());
     }
 
     private void updateOCFile(OCFile file, RemoteFile remoteFile) {