clean up insert function

src/brovski-adress-etiketten-verwaltung.py

@@ -278,10 +278,8 @@ class Application:
         settings.wait_window()
 
     def insert_record(self):
-        self.open_window(InsertRecord)
         if self.current_record is not None:
             self.clear_entry_fields()
-        children = self.table.get_children()
         values = [
             "x",
             "Firma",