test: fix test-crypto-stream.js

A recent merge of v0.10 to v0.12
(0c7f6ca8) upgraded OpenSSL to version
1.0.1j. In v0.10, this required test-crypto-stream.js to be fixed with
commit 707cc250. Basically, instead of
returning the proper error, Err_get_error() would return 0 and the test
for the error message needed to be updated in test-crypto-stream.js.

However, in the v0.12 branch, crypto error messages are handled a bit
differently since commit 26a1b712


landed. Instead of returning the default OpenSSL error message, it makes
the decipher stream return a default message specific to Node.js.

This commit updates test-crypto-stream.js to test the error object
against the proper default error message.

Fixes #9019.

Reviewed-by: Trevor Norris <trev.norris@gmail.com>