Fix behavior of "exit search" button in lesson search

[jonboiser]

Summary

Fixes #4918

Reviewer guidance

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References

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Contributor Checklist

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

Testing:

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Gherkin stories have been updated
• Unit tests have been updated

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.rst

[codecov]

Codecov Report

Merging #4929 into release-v0.12.x will increase coverage by 0.01%.
The diff coverage is 0%.

@@                 Coverage Diff                 @@
##           release-v0.12.x    #4929      +/-   ##
===================================================
+ Coverage             49.9%   49.91%   +0.01%     
===================================================
  Files                  882      882              
  Lines                27460    27495      +35     
  Branches              3634     3645      +11     
===================================================
+ Hits                 13703    13725      +22     
- Misses               12960    12973      +13     
  Partials               797      797

Impacted Files	Coverage Δ
...ach/assets/src/modules/coachNotifications/index.js	0% <ø> (ø)	⬆️
...h/assets/src/modules/coachNotifications/getters.js	3.12% <ø> (+0.09%)	⬆️
...c/views/plan/LessonResourceSelectionPage/index.vue	0% <0%> (ø)	⬆️
kolibri/utils/conf.py	80.7% <0%> (-3.51%)	⬇️
kolibri/utils/cli.py	67.25% <0%> (-2.47%)	⬇️
kolibri/plugins/coach/class_summary_api.py	56.09% <0%> (ø)	⬆️
kolibri/plugins/coach/api_urls.py	100% <0%> (ø)	⬆️
kolibri/core/logger/api.py	84.74% <0%> (+0.81%)	⬆️
kolibri/plugins/coach/api.py	49.1% <0%> (+2.53%)	⬆️

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[codecov]

Codecov Report

Merging #4929 into release-v0.12.x will decrease coverage by <.01%.
The diff coverage is 0%.

@@                Coverage Diff                 @@
##           release-v0.12.x   #4929      +/-   ##
==================================================
- Coverage             49.9%   49.9%   -0.01%     
==================================================
  Files                  882     882              
  Lines                27460   27440      -20     
  Branches              3634    3633       -1     
==================================================
- Hits                 13704   13694      -10     
+ Misses               12959   12949      -10     
  Partials               797     797

Impacted Files	Coverage Δ
...s/coach/assets/src/views/home/HomeActivityPage.vue	0% <ø> (ø)	⬆️
...ach/assets/src/modules/coachNotifications/index.js	0% <ø> (ø)	⬆️
...h/assets/src/modules/coachNotifications/getters.js	3.12% <ø> (+0.09%)	⬆️
...plugins/coach/assets/src/modules/groups/actions.js	0% <ø> (ø)	⬆️
...c/views/plan/LessonResourceSelectionPage/index.vue	0% <0%> (ø)	⬆️
kolibri/utils/conf.py	80.7% <0%> (-3.51%)	⬇️
kolibri/utils/cli.py	67.25% <0%> (-2.82%)	⬇️
kolibri/plugins/coach/class_summary_api.py	56.09% <0%> (ø)	⬆️

---

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[rtibbles]

Fixes the issue, everything working as expected.