Remove code generating comments in configuration file

tests/app/test_homeserver_start.py

@@ -21,7 +21,7 @@
 class HomeserverAppStartTestCase(ConfigFileTestCase):
     def test_wrong_start_caught(self):
         # Generate a config with a worker_app
-        self.generate_config()
+        self.generate_config_and_remove_lines_containing("registration_shared_secret")
         # Add a blank line as otherwise the next addition ends up on a line with a comment
         self.add_lines_to_config(["  "])
         self.add_lines_to_config(["worker_app: test_worker_app"])

tests/config/test_load.py

@@ -74,7 +74,7 @@ def test_load_succeeds_if_macaroon_secret_key_missing(self):
         )
 
     def test_disable_registration(self):
-        self.generate_config()
+        self.generate_config_and_remove_lines_containing("registration_shared_secret")
         self.add_lines_to_config(
             ["enable_registration: true", "disable_registration: true"]
         )