fix(examples): propagate IK solution to model state in Franka example (newton-physics#1637)

Author: alecive

newton/examples/ik/example_ik_franka.py

@@ -120,6 +120,7 @@ def capture(self):
 
     def simulate(self):
         self.solver.step(self.joint_q, self.joint_q, iterations=self.ik_iters)
+        wp.copy(self.model.joint_q, self.joint_q)
 
     def _push_targets_from_gizmos(self):
         """Read gizmo-updated transform and push into IK objectives."""