Fix title validation error bug in quizSection

[ozer550]

Summary

• Fix the incorrect value of title being passed down in the KTextbox.

References

Reviewer guidance

• Go to the quiz section.
• Try adding a section, the validation error popping earlier in the console is fixed!

Testing checklist

• Contributor has fully tested the PR manually
• 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

• PR has the correct target branch and milestone
• 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

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.0b9.dev0_git.391.gf0e3738d.pex
TAR file	kolibri-0.16.0b9.dev0+git.391.gf0e3738d.tar.gz
WHL file	kolibri-0.16.0b9.dev0+git.391.gf0e3738d-py2.py3-none-any.whl

[marcellamaki]

Nice debugging @ozer550!

[marcellamaki]

Bypassing failing installer builds as this is a github actions changed, and it is fixed in 0.16.x and will be merged into develop today.