Remove coach page specific sub nav toggling.

[rtibbles]

Summary

• Before we finalized the updates to the AppBar for conditional display in certain app contexts, we had added it individually in the Coach plugin
• This caused the coach top nav to not display in non-touch device contexts in app mode
• Cleans this up and removes unused prop

Reviewer guidance

Run the Mac App or run the local development app server command
Go to the coach plugin
Ensure that once you have selected a facility and a class the top nav displays

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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
• 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-0.16.0b10.dev0_git.139.gd44fe14c.pex
Windows Installer (EXE)	kolibri-0.16.0b10.dev0+git.139.gd44fe14c-unsigned.exe
Debian Package	kolibri_0.16.0b10.dev0+git.139.gd44fe14c-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b10.dev0+git.139.gd44fe14c-0.3.0.dmg
Android Package (APK)	kolibri-0.16.0b10.dev0+git.139.gd44fe14c-0.1.0-debug.apk
TAR file	kolibri-0.16.0b10.dev0+git.139.gd44fe14c.tar.gz
WHL file	kolibri-0.16.0b10.dev0+git.139.gd44fe14c-py2.py3-none-any.whl

[radinamatic]

Running fine with the app bar displaying correctly with dev environment in app context:

[radinamatic]

Will approve after @pcenov confirms the fix on the macOS.

[pcenov]

@radinamatic I confirm that the top navigation is displayed in the mac app as well.

[radinamatic]

Manual QA passes, good to go! 💯

[akolson]

Clean up looks good to me! Thanks @rtibbles