implemented config absender to csv export

src/brovski-adress-etiketten-verwaltung.py

@@ -263,10 +263,8 @@ class Application:
                         writer.writerow(line)
                         # todo: add "absender" to config parameters
                         line = []
-                        line.append("Absender:")
-                        line.append("Matthias Braun")
-                        line.append("Wolfacherweg 1")
-                        line.append("5724 Dürrenäsch")
+                        for idx in range(4):
+                            line.append(self.config.get("absender", f"{idx}"))
                         writer.writerow(line)
         except FileNotFoundError:
             show_error(message_title="Unexpected error",