For the last six years, Chris Delgado cooked Spanish tapas for suburban diners as chef of One 19 North Tapas and Wine Bar in Kirkwood. But now he's got a new, more casual calling — chef and co-owner of the Wood Shack(1862 South 10th Street, 314-833-4770) in Soulard.The playful little sandwich shop, co-owned by Patrick McGinnis, opened Tuesday, taking over the spot just around the corner from Chava's.…