WebCrypto API allows user to input case-insensitive algorithm name, and
overwrites it with standardized algorithm name internally, by Step 7 of
<https://w3c.github.io/webcrypto/#dfn-normalize-an-algorithm>.
This step is missing for some cases. This patch brings it back.
Testing: Existing tests suffice.
Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>