Update naming for Brunei

Geography was never my strong side but I came across this problem when someone choose their country as "Brunei" from a country dropdown. Seems according to Wikipedia that the name is "Brunei" with the official name being "Nation of Brunei, Abode of Peace" while the official _Malay_ name is "Negara Brunei Darussalam".

Please correct me if I'm wrong though!