Fixes operational space unit test to avoid pi rotation error (#545)

# Description

This PR fixes the OperactionalSpaceController not passing issue

## Type of change

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- Bug fix (non-breaking change which fixes an issue)


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## Checklist

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source/isaaclab/test/controllers/test_operational_space.py

@@ -123,7 +123,7 @@ def sim():
         [
             [0.0, torch.pi / 2, 0.0],  # for [0.707, 0, 0.707, 0]
             [torch.pi / 2, 0.0, 0.0],  # for [0.707, 0.707, 0, 0]
-            [torch.pi, 0.0, 0.0],  # for [0.0, 1.0, 0, 0]
+            [torch.pi / 2, torch.pi / 2, 0.0],  # for [0.0, 1.0, 0, 0]
         ],
         device=sim.device,
     )