iclouddrive: lowercase Apple ID for SRP authentication

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Apple IDs are case-insensitive, but the SRP proof computation (M1)
hashes the username client-side. The old plaintext signin let the
server normalize the case, but with SRP the client must match.
Lowercase the Apple ID before use so mixed-case IDs authenticate
correctly.

Reported-by: ArturKlauser

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500 Internal Server Error

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