In `NormalizedAlgorithm::get_key_length`, we match the wrong enum
variants for HKDF and PBKDF2. Therefore, the function wrongly returns
`NotSupportedError` for them. It causes a few WPT tests fail. This patch
fix it with correct enum variants.
Testing: Pass some WPT tests that were expected to fail.
Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>