fix: add missing variables to library_listing context

[Ian2012]

Description

This PR fixes an internal error raised when the waffle flag contentstore.split_library_on_studio_dashboard is enabled and users access to the /home_library view. It failed because the library view doesn't have in the context, the variables introduced in the PR that added the dropdown functionality #30975

Supporting information

The PR that added the dropdown functionality is this one #30975

Testing instructions

1. Enable the waffle flag contentstore.split_library_on_studio_dashboard .
2. Go to the CMS and open select Libraries or go directly to the view /home_library .
3. See the error.

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[connorhaugh]

Looks good to me. For those playing along at home, the testing instructions are:

1. Enable the waffle flag contentstore.split_library_on_studio_dashboard.
2. Go to the CMS and open select Libraries or go directly to the view /home_library.
3. See the library listing page.
4. Disable the waffle flag
5. /home http://localhost:18010/home#libraries-tab still works.

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@Ian2012 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[connorhaugh]

Thank you so much @Ian2012 !

[Ian2012]

@connorhaugh glad to help!

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.