Save headers error with resource decorator

[aymericdo]

Make sure you are running the latest version of TinyWeb before reporting an issue.

Device and/or platform:
Raspberry Pico

Description of problem:
When I use "save_headers" params in @app.resource, it cause an error because save_headers params are not following here https://github.com/belyalov/tinyweb/blob/master/tinyweb/server.py#L631

Expected:
We should be able to use this param with the resource decorator and why not, having back the list of those headers in the data response.

Additional info:

[aymericdo]

We could just remplace the https://github.com/belyalov/tinyweb/blob/master/tinyweb/server.py#L631
with save_headers=kwargs.pop('save_headers', ['Content-Length', 'Content-Type']), ?