Fix buffer conversion in frames_listener function#38
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In current form get the following error:
```python
AttributeError: 'builtins.Sample' object has no attribute 'value'
callback error
Traceback (most recent call last):
File "/Users/michaelmentele/Development/trying-shit/zenoh-demos/computer-vision/zcam/zcam-python/zdisplay.py", line 37, in frames_listener
npImage = np.frombuffer(bytes(sample.value.payload), dtype=np.uint8)
^^^^^^^^^^^^
AttributeError: 'builtins.Sample' object has no attribute 'value'
^CTraceback (most recent call last):
File "/Users/michaelmentele/.local/share/uv/python/cpython-3.13.1-macos-aarch64-none/lib/python3.13/threading.py", line 1540, in _shutdown
_thread_shutdown()
KeyboardInterrupt:
```
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Bug
When running as instructed:
With the change
Works as expected, though apparently my webcam makes thumbs up emojis that linger when I thumbs up.
