Fix #260 prevent pass duplicated kwargs to scrapping_strategy

[darwing1210]

This pull request includes a change to the crawl4ai/async_webcrawler.py file, specifically modifying the aprocess_html function to use the pop method for extracting keyword arguments instead of the get method.

Codebase simplification:

• crawl4ai/async_webcrawler.py: Changed the aprocess_html function to use kwargs.pop instead of kwargs.get for only_text and image_description_min_word_threshold. This ensures that these keyword arguments are removed from kwargs after being accessed to prevent pass duplicated kwargs to scrapping_strategy.

[unclecode]

Thanks for your collaboration and contributions.