Fix : example_hear_grasp.py

[shanki98]

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This example was created 2 years ago by @LarsJanssenTUe . The Hear Smach state uses the Ears object that is depreciated and not used. The issue is that, Ears makes a function call using _hmi.old_query, but the robot has no attribute called _hmi. However the function is present inside the api robot part. Should I proceed making changes here or leave it because we don't use ears anymore