bugfix, timestampTrade.py set a default config value

Bugfix, set a default value for the config option as it does not exist in the plugin config until the value has been set.

plugins/timestampTrade/timestampTrade.py

@@ -456,6 +456,7 @@ def getImages(gallery_id):
 settings={
     'createGalleryFromScene':True,
     'createMovieFromScene':True,
+    'extraUrls':True,
  }
 if 'timestampTrade' in config:
     settings.update(config['timestampTrade'])