Fixing bug. Making a deep copy of the default config dict.

Author: guiferviz

genanki/deck_conf.py

@@ -52,7 +52,7 @@ class DeckConf:
   def __init__(self, deck_conf_id, name, conf=None):
     self.deck_conf_id = deck_conf_id
     self.name = name
-    conf = DEFAULT_CONF.copy() if conf is None else conf
+    conf = DEFAULT_CONF.deepcopy() if conf is None else conf
     conf["name"] = self.name
     conf["id"] = self.deck_conf_id
     self.conf = conf