Fix type casting for wp.argmax return value in GripperCreator

[myurasov-nv]

Description

wp.argmax() returns a warp type that cannot be used directly as a Python int for indexing and arithmetic. This causes runtime errors in GripperCreator._find_grasp_parameters() when computing open_axis, approach_axis, and mid_axis.

Changes

• Wraps wp.argmax() calls with int() in scripts/graspgen/create_gripper_lab.py to ensure proper type for subsequent indexing and arithmetic operations.

Testing

• I have verified that sample commands now work (were broken before): https://github.com/NVlabs/GraspDataGen/blob/main/docs/installation.md#:~:text=Once%20the%20docker%20container%20is%20build%2C%20you%20can%20test%20the%20instalation%20by%20generating%20some%20grasps%20and%20then%20validating%20a%20few%20of%20them%20on%20an%20object%20already%20in%20the%20GraspDataGen%20repo.