Inject registration option into ZfcUserLoginWidget

This PR is intended to fix an issue with the ZfcUserLoginWidget. This displays a login form but the link to the registration form which should be displayed at the bottom is missing. This problem only affects the login form created by the ZfcUserLoginWidget view helper. The link displays correctly on the form displayed in the normal login view. The issue is discussed more fully here https://github.com/ZF-Commons/ZfcUser/issues/298.

The fix was to inject the registration option directly to the view helper and use $options->getEnableRegistration() instead of $this->enableRegistration.