Add filename setting for uniquestWidgetBidAdapter to ensure proper download on download page.

[kazutoshi-uekawa-muneee]

🏷 Type of documentation

• new bid adapter
• update bid adapter
• new feature
• text edit only (wording, typos)
• bugfix (code examples)
• new examples

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• For new adapters check submitting your adapter docs

Other

Short Description

The adapter appeared on the download page, but downloading a custom Prebid.js bundle resulted in an error unless the filename field was explicitly specified.

This update adds the required filename setting so that the uniquestWidgetBidAdapter downloads correctly and is properly included in custom builds.

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[kazutoshi-uekawa-muneee]

Now that the latest Prebid.js release is available and the adapter downloads correctly,
this documentation update is no longer required.

Thank you for your time and support! 🙇‍♂️

[muuki88]

Thanks for keeping the PR queue clean 🙏