need to invalidate notetype cache on sync completion

basicCheck() was populating it on startup sync, leading to
https://forums.ankiweb.net/t/error-when-adding-a-new-note/1664

qt/aqt/main.py

@@ -907,6 +907,7 @@ title="%s" %s>%s</button>""" % (
 
         def on_collection_sync_finished():
             self.col.clearUndo()
+            self.col.models._clear_cache()
             self.reset()
             after_sync()