aws/signer/v4: Revert #1491, conflicts with undocumented spec test cases #1499
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Reverts #1491 change since it conflicts with the AWS v4 signer test cases found in #1495. This case is not documented in the V4 spec. Additional research is needed before #1491 can be accepted. As either a implementation detail of the test cases, or an undocumented requirement of the spec.