Resolves #10607 Radio button change event was triggered even if it was already active

Created by: alexbea

If the radiobutton is already active, it won't trigger the change event.

Tested on Firefox 24.0 and Chromium 28.0.1500.71

Edit : @clement911 suggested that radiobuttons could trigger the click event too. Now it has the same behaviour as input type radio.

Resolves #10607 (closed).