Load channel content on remove filter

Summary

showLibrary is the method we use to load and show the channels. But if we have filters, it never sets the rootNodes array. The problem was that we were not calling that method again when we removed the filters, so if we had filters in the first render, these channels would never have been loaded.

https://github.com/learningequality/kolibri/assets/51239030/e4547885-62b8-464b-a0b7-6f23013cbc9a

References

Closes #12328.

Reviewer guidance

Replicate #12328.

Testing checklist

[x] Contributor has fully tested the PR manually
[x] If there are any front-end changes, before/after screenshots are included
[ ] Critical user journeys are covered by Gherkin stories
[ ] Critical and brittle code paths are covered by unit tests

PR process

[x] PR has the correct target branch and milestone
[x] PR has 'needs review' or 'work-in-progress' label
[ ] If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
[ ] If this is an important user-facing change, PR or related issue has a 'changelog' label
[ ] If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

Automated test coverage is satisfactory
PR is fully functional
PR has been tested for accessibility regressions
External dependency files were updated if necessary (yarn and pip)
Documentation is updated
Contributor is in AUTHORS.md

Asset type	Download link
PEX file	kolibri-.pex
Windows Installer (EXE)	kolibri-0.17.0a0.dev0+git.154.gc7b3ebda-windows-setup-unsigned.exe
Debian Package	kolibri_0.17.0a0.dev0+git.154.gc7b3ebda-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.17.0a0.dev0+git.154.gc7b3ebda-0.4.2.dmg
Android Package (APK)	kolibri-0.17.0a0.dev0+git.154.gc7b3ebda-0.1.3-debug.apk
TAR file	kolibri-0.17.0a0.dev0+git.154.gc7b3ebda.tar.gz
WHL file	kolibri-0.17.0a0.dev0+git.154.gc7b3ebda-py2.py3-none-any.whl

learningequality / kolibri

Load channel content on remove filter #12379