aws/signer/v4: Fix X-Amz-Content-Sha256 being in to query for presign #1976
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Fixes the bug which would allow the X-Amz-Content-Sha256 header to be
promoted to the query string when presigning a S3 request.
This bug also was preventing users from setting their own sha256 value
for a presigned URL. Presigned requests generated with the custom sha256
would of always failed with invalid signature.
S3 presign requests without a user specified X-Amz-Content-Sha256 will
no longer include the X-Amz-Content-Sha256 in the header nor query. The
X-Amz-Content-Sha256 header only needs to be set if it contains a non
UNSIGNED-PAYLOAD value.
Fix #1974