Bug 1089486 - [NFC] Disable NFC toggle in settings during NFC HW change,  r=arthur.chen, r=gweng

https://bugzilla.mozilla.org/show_bug.cgi?id=1089486
This handler is not required as whether to enable or disable should only depend on the value of `nfc.status`. We disable the checkbox when `nfc.status` is in transition states.