HOLLYWOOD—Dear Mike: Why oh WHY did that darling Jesse Pearson flop in his nightclub act at the Slate Brohters? I thought he was so YUMMY in “Bye Bye Birdie.—Marie Currie, Beverly Hills, Calif,Dear Marie: Jesse made the mistake of refusing to sing any of his “Birdie songs, to wear anything even slightly resembling that gold lame outfit he wore in the film, or to in any other way identify himself with the picture. It didn't work out—any more than it wouldif Judy Garland were to do a concert without singing “Over the Rainbow—so they brought in Vic Dana to replace him.