[ie/pbs] Accepts pbssocal (#8703)

[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
• 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:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

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

[bashonly]

Suggested change

	(?:www\.)?(pbs|pbssocal)\.org/(?:[^/]+/){1,5}(?P<presumptive_id>[^/]+?)(?:\.html)?/?(?:$|[?\#]) |
	(?:www\.)?pbs(?:socal)?\.org/(?:[^/]+/){1,5}(?P<presumptive_id>[^/]+?)(?:\.html)?/?(?:$|[?\#]) |