Fix switching libraries and geenrating a catalog could generate a catalog for the wrong library

src/calibre/gui2/convert/gui_conversion.py

@@ -28,6 +28,8 @@ def gui_catalog(fmt, title, dbspec, ids, out_file_name, sync, fmt_options, conne
     if log is None:
         log = Log()
     from calibre.library import db
+    from calibre.utils.config import prefs
+    prefs.refresh()
     db = db()
     db.catalog_plugin_on_device_temp_mapping = dbspec