[ie/PBS] Support PBS SoCal URLs

[n10dollar]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

ADD DESCRIPTION HERE

closes #8703

Fixes a tiny issue where pbs URLs were accepted but not pbssocal URLs. The accepted string group "pbs" was simply changed to "(pbs|pbssocal)". The issue was solved earlier but the contributer didn't seem to follow through with the PR.

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
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• 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)

[bashonly]

add a test with the newly supported domain