[Core] Fix typo in AUTH_LEVEL_MAPPING

Closes: https://github.com/deluge-torrent/deluge/pull/387

deluge/core/authmanager.py

@@ -28,8 +28,8 @@ log = logging.getLogger(__name__)
 AUTH_LEVELS_MAPPING = {
     'NONE': AUTH_LEVEL_NONE,
     'READONLY': AUTH_LEVEL_READONLY,
-    'DEFAULT': AUTH_LEVEL_NORMAL,
-    'NORMAL': AUTH_LEVEL_DEFAULT,
+    'DEFAULT': AUTH_LEVEL_DEFAULT,
+    'NORMAL': AUTH_LEVEL_NORMAL,
     'ADMIN': AUTH_LEVEL_ADMIN,
 }
 AUTH_LEVELS_MAPPING_REVERSE = {v: k for k, v in AUTH_LEVELS_MAPPING.items()}