Change isActive to be type agnostic

[MGatner]

Entities/User.php currently checks if a user is active by checking if $this->attributes['active'] === true, but since internal functions don't use casts this attribute will rarely (never?) be a boolean. This PR changes the comparison to == which will allow for common database boolean type returns (e.g. 1).

[dafriend]

Just my $.02, but I'd rather see isActivated() remain as-is and have $this->attributes['active'] always be explicity set with a boolean value.

[MGatner]

I get the desire, but I would rather see this entity perform in a consistent manner with the main framework, especially since this is (for now) the reference auth library, and probably even the main reference module. If there's a case for entities casting database booleans as language booleans I'd rather see it brought up in the framework core.