Fixed failing unit test - ember/object get function was removed from source code so I have changed unit test accordingly

[candunaj]

Issue

I have fixed a unit test which was failing quietly

Explanation

"get" function was used for getting tokenAttribute and identificationAttribute. So there could be used path to property like "employee.token"

const tokenAttribute = get(data, tokenAttributeName);
const identificationAttribute = get(data, identificationAttributeName);

it was changed 5 years ago with PR #957

_data[tokenAttributeName]
_data[identificationAttributeName]

After that change, only the property name could be used in tokenAttributeName. There was tokenAttributeName: 'employee.token' used in one test. So that test was failing. It was failing quietly because there was "throw undefined" which mocha does not catch.
I have fixed that test by using resourceName:'employee' and tokenAttributeName:'token' as required by code change.

authenticator = Devise.extend({ tokenAttributeName: 'employee.token', identificationAttributeName: 'employee.email' }).create();

authenticator = Devise.extend({ resourceName: 'employee', tokenAttributeName: 'token', identificationAttributeName: 'email' }).create();

[marcoow]

I don't understand how title and description of the PR relate to the changes tbh…

[marcoow]

Can you update the title though so it actually describes what this PR does?