fix the signing config

[TingDaoK]

https://github.com/awslabs/aws-crt-python/blob/main/awscrt/auth.py#L608-L609

The AwsSigningConfig has default values.

        use_double_uri_encode (bool): Whether to double-encode the resource path
            when constructing the canonical request (assuming the path is already
            encoded). Default is True. All services except S3 use double encoding.

        should_normalize_uri_path (bool): Whether the resource paths are
            normalized when building the canonical request. Default is True.

But, the signing config is for s3, and SDK will encode the URI before pass into CRT, so, set them to false.