Fix deprecation warnings in test_ltx_image2video.py

[AChowdhury1211]

What does this PR do?

This PR fixes two warnings that appeared during testing:

• A FutureWarning related to image tensor value range in image_processor.py.
• A DeprecationWarning regarding array_wrap usage in NumPy 2.0 in the test script.

These minor changes help clean up test output and ensure future compatibility.

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[yiyixuxu]

thanks!

[AChowdhury1211]

Hi! Thanks for approving!
This was my first PR, will continue working on LTX and excited to contribute further!