[extractor/iwara] Add access token

[toomyzoom]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

Add access token using login info for non private video that is not accessible without account.

Some video would show up as deleted/not exist if not logged in. This is not related to private videos.
If an access token is sent with the http request, the video is accessible. My assumption is those videos are tagged as NSFW/not appropriate for public access.

Fixes #6671

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

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What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

[toomyzoom]

Added changes follow reviewers suggestion

[Lesmiscore]

I think it's good to merge
Also please do not force-push next time

[bobbbob98]

Anything else need doing with this? I'd like to be able to download these.

[user1872372839]

Just an update, ever since today (yesterday it was working perfectly), the login API is not working anymore. If you try to login, all downloads (even those that are not privated/hidden) will fail. It will still work on most of the videos if you remove the username/login, but then private/blocked tags videos will not download.

Example: yt-dlp.exe -f b* --username $userhere --password $passwordhere $downloadlink

Result:
[iwara]: Unable to download JSON metadata: HTTP Error 403: Forbidden (caused by <HTTPError 403: 'Forbidden'>); please report this issue on https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using yt-dlp -U

Using cookies does not work. Using cookies didn't work before either.

[bashonly]

@user1872372839 can you open a new issue about this?