Update cameras.py - removed duplicate lines (#2661)

The self.times was being computed twice in cameras.py in the same function which was unnecessary

nerfstudio/cameras/cameras.py

@@ -872,8 +872,6 @@ class Cameras(TensorDataclass):
         else:
             metadata = {"directions_norm": directions_norm[0].detach()}
 
-        times = self.times[camera_indices, 0] if self.times is not None else None
-
         return RayBundle(
             origins=origins,
             directions=directions,