improve mv output quality when right angle input provided

re-order mv index to align with shapegen expectation

- Switch the order of right and back in Hy3DGenerateMeshMultiView's
view_dict to match the order expected by Shapegen's conditioner.py:
  self.view2idx = {
      'front': 0,
      'left': 1,
      'back': 2,
      'right': 3
  }
- This improves the generated quality for those areas.
- No workflow update needed as the expected input order remains the same.

nodes.py

@@ -1297,8 +1297,8 @@ class Hy3DGenerateMeshMultiView():
         view_dict = {
             'front': front,
             'left': left,
-            'right': right,
-            'back': back
+            'back': back,
+            'right': right
         }
 
         if scheduler == "FlowMatchEulerDiscreteScheduler":