When Viktoria Modesta had her damaged leg amputated at the age of 20, it liberated her to pursue her musical ambitions. Now she’s hijacking the X Factor and getting millions of hits, she says disability is no barrier to stardom. But do the rest of us agree?At the age of 15, Viktoria Modesta decided it was time to lose her lower left leg, but it took her another five years to convince a surgeon to do it.