LOS ANGELES (Reuters) – The number of Americans who watched vocal powerhouse Candice Glover win the “American Idol” title sank to 14.2 million, a decline of 31 percent from last year’s record low, according to ratings data on Friday. The singing competition, now in Season 12, was once a TV industry juggernaut for Fox that brought in more than 30 million viewers for its finale in the peak years of 2006 and 2007. On Thursday night, it was the second most-watched program on U.S. television, beat out by the season finale of CBS comedy “The Big Bang Theory” with 14.8 million viewers. …