Fix Selenium screenshot cropping issue by retrying with larger height

[Archkik]

In some environments, the hardcoded +90 height buffer used in set_window_size() is insufficient to capture the entire table, resulting in the bottom portion of the image being cut off.

This PR adds a simple retry mechanism:

• It first takes a screenshot using the standard height buffer;
• If the captured image height is still smaller than the required table height, it increases the height and retries once.

[PaleNeutron]

Thanks for contribution, I think it is a nice idea.