Link to new quiz creation properly.

[rtibbles]

Summary

• When no practice quizzes were loaded onto the local device, the simple button for 'new quiz' was using the wrong link
• This updates this, and makes sure we use the same base link object for both situations, so at least if we break it for one, we break it for both :)

References

Fixes #12302

Reviewer guidance

Import exercises, but no practice quizzes.
See that creating a new quiz takes you to a full URL.
See that you can select questions to add to the quiz.

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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
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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-.pex
Windows Installer (EXE)	kolibri-0.17.0a0.dev0+git.125.gea3dea55-windows-setup-unsigned.exe
Debian Package	kolibri_0.17.0a0.dev0+git.125.gea3dea55-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.17.0a0.dev0+git.125.gea3dea55-0.4.2.dmg
Android Package (APK)	kolibri-0.17.0a0.dev0+git.125.gea3dea55-0.1.3-debug.apk
TAR file	kolibri-0.17.0a0.dev0+git.125.gea3dea55.tar.gz
WHL file	kolibri-0.17.0a0.dev0+git.125.gea3dea55-py2.py3-none-any.whl

[marcellamaki]

@pcenov @radinamatic

[pcenov]

Hi @rtibbles, I confirm - creating a quiz is working correctly now with or without any available practice quizzes.