fix: always trigger the switchChange event after a change event

With 2 or more radio buttons, a change to the first radio button propagates correctly, while the change to the second one won't (as it is always skipped). This fixes it by propagating `switchChange.bootstrapSwitch` after every `change.bootstrapSwitch`.

Everything else keeps working.

Same as #349 but from the latest `develop` branch.
This is also needed to close https://github.com/frapontillo/angular-bootstrap-switch/issues/46.