Hip-hop artist Dizzee Rascal had one of the most acclaimed albums of the decade when he released “Boy in da Corner” last year, and he’s back with his sophomore effort “Showtime” and an upcoming show at the 9:30 Club on Monday, April 25. Lucky for you, DCist has got a pair of tickets, a copy of the record and a t-shirt to give away! If you’d like a chance to check out Dizzee Rascal’s brash,…