PROD-865#2064 - Fix Forum List Widgets Disregarding (Parent Forum ID) on the widget query

[kent-carlo]

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Changes proposed in this Pull Request:

Fixes #2064.

How to test the changes in this Pull Request:

https://www.loom.com/share/fb483f0633b4409fa618eafce47c9b36

Proof Screenshots or Video

https://www.loom.com/share/fb483f0633b4409fa618eafce47c9b36

Other information:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Have you written new tests for your changes, as applicable?
• [x] Have you successfully run tests with your changes locally?

Changelog entry

Fixed forum parent ID so can display all forums using 'any' and display only parent forums using '0' option.