crypto: testmgr - remove superfluous initializers for xts(aes)

The test vectors for 'xts(aes)' contain superfluous initializers.
Remove them.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>