By DCist Contributor Mehan Jayasuriya It’s about an hour before The Pipettes are set to take the stage at the Black Cat and by rights, the band should be exhausted. This is the second gig on their first major North American tour and having flown in from their hometown of Brighton, England only a few days prior, you’d think that the band would be succumbing to the effects of trans-Atlantic jetlag. Unlike the dozing…