Class `_User` does not appear in filter dialog

[mtrezza]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest versions of Parse Server and Parse Dashboard.

Issue Description

When a class has a field of type pointer to the _User class, the class does not appear in the filter dialog drop down.

Steps to reproduce

1. Create class "Temp".
2. Add field "user" of type pointer to _User.
3. Open filter dialog and under try to select _User in dropdown "Class".

Actual Outcome

There is no item _User in dropdown "Class".

Expected Outcome

There should be an item _User in dropdown "Class" since the class has a pointer field to the _User class.

Environment

Dashboard

• Parse Dashboard version: 6.0.0-alpha.11

[parse-github-assistant]

Thanks for opening this issue!

• 🚀 You can help us to fix this issue faster by opening a pull request with a failing test. See our Contribution Guide for how to make a pull request, or read our New Contributor's Guide if this is your first time contributing.