Fix incorrect reference in Add Virtual Authenticator

[emlun]

§11.3. Add Virtual Authenticator currently reads:

[...]
3. For each enumerable own property in parameters:

1. Let key be the name of the property.
2. Let value be the result of getting a property named key from parameters.
3. If there is no matching key for key in parameters, return a WebDriver error with WebDriver error code invalid argument.
4. If value is not one of the valid values for that key, return a WebDriver error with WebDriver error code invalid argument.
5. Set a property key to value on authenticator.
   [...]

The third step seems like it was intended to instead refer to Authenticator Configuration as the set of valid keys:

3. If there is no matching key for key in Authenticator Configuration, return a WebDriver error with WebDriver error code invalid argument.

The subsequent step 5 checks that all properties of Authenticator Configuration are defined in parameters, so it seems it would make sense that step 3.3 would perform the opposite check, which would make the combination of both a set equality check rather than just a subset check.

@nsatragno Is the above assessment accurate?

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[nsatragno]

Yep, your assessment is correct, good catch! Approved.