Remove extensions from replay file

We always want to use the template provided extensions, keeping our own
list only makes it more likely to have errors when upgrading.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.cookiecutter-replay.json

@@ -13,17 +13,6 @@
     "pypi_package_name": "frequenz-channels",
     "github_repo_name": "frequenz-channels-python",
     "default_codeowners": "@frequenz-floss/python-sdk-team",
-    "_extensions": [
-      "jinja2_time.TimeExtension",
-      "local_extensions.default_codeowners",
-      "local_extensions.github_repo_name",
-      "local_extensions.keywords",
-      "local_extensions.pypi_package_name",
-      "local_extensions.python_package",
-      "local_extensions.src_path",
-      "local_extensions.title",
-      "local_extensions.as_identifier"
-    ],
     "_template": "gh:frequenz-floss/frequenz-repo-config-python"
   }
 }