Missing `await` in `ad_block` option code led to `RuntimeWarning: coroutine 'Browser.wait' was never awaited`

## Missing `await` in `ad_block` option code led to `RuntimeWarning: coroutine 'Browser.wait' was never awaited`

Discovered in overnight GitHub Actions testing.

Technically it was a harmless warning, since Walmart was still scraped successfully, but a warning appeared during the running of the script.

https://github.com/mdmintz/undetected-testing/actions/runs/27462762101/job/81179534491#step:17:13

<img width="650" height="350" alt="Image" src="https://github.com/user-attachments/assets/739470fb-3a47-406f-9056-f0934a659a9e" />

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Missing `await` in `ad_block` option code led to `RuntimeWarning: coroutine 'Browser.wait' was never awaited` #4388