fix: content_id access from wrong object

[himanshuc3]

Summary

Remove wrongful access of property resulting in silent console error.
Root issue being content_id being accessed from content rather than contentNode. It would be better to have consistent prop naming and replacing content with contentNode or visa versa so as to avoid such errors in future.

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References

References #9074

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After:

Reviewer guidance

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[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.0a0.dev0_git.747.g11d0cc3f.pex
Windows Installer (EXE)	kolibri-0.16.0a0.dev0+git.747.g11d0cc3f-unsigned.exe
Debian Package	kolibri_0.16.0a0.dev0+git.747.g11d0cc3f-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0a0.dev0+git.747.g11d0cc3f-0.4.0.dmg
Android Package (APK)	kolibri-0.16.0a0.dev0+git.747.g11d0cc3f-0.1.0-debug.apk
TAR file	kolibri-0.16.0a0.dev0+git.747.g11d0cc3f.tar.gz
WHL file	kolibri-0.16.0a0.dev0+git.747.g11d0cc3f-py2.py3-none-any.whl

[himanshuc3]

@bjester I assume I don't need to do anything further wrt CI builds.

[rtibbles]

Excellent work, thank you!