From left: Alexander Hurt (Gregers Werle) and Nick Westrate (Hjalmar Ekdal) in Shakespeare Theatre Company's "The Wild Duck" (Photo by Gerry Goodstein) In the shadow of the White House, two plays by Henrik Ibsen are currently being staged that explore “truth” in different ways — “An Enemy of the People” at Theater J and “The Wild Duck” at Shakespeare Theatre Company (STC). * At a Nov. 2 symposium sponsored by STC, Hayley Finn, the artistic director of Theatre J, talked about