By Nicola Fahey & Laura Armstrong Superstar will.i.am has opened up about his pal Britney Spears’s fight back to freedom, saying he believes she will never quit music and may even tour again. The Voice coach Will has known the I’m A Slave 4 U singer since they released 2012 hit Scream and Shout. He also collaborated with her on tracks Work Bitch and It Should Be Easy, and executive produced her album Britney Jean. Their latest hit, Mind Your Business, was released last year. And his comments will bring Britney’s army of fans fresh hope after she vowed last month to never return to the music in…