fix(tests): fetchAccount() should throw 401
fix(tests): fetchAccount() should throw 401

This commit changes the behavior of the account.js test to ignore
the error throw in `findAccount()`.  This is the default behavior for
most other tests found in the test suite.

aksalj/africastalking-node.js,AfricasTalkingLtd/africastalking-node.js,aksalj/africastalking-node.js