fix: onUnmounted warning in topnav

[elevatebart]

When opening the launchpad I get warnings on the homepage

[Vue warn]: onUnmounted is called when there is no active component instance to be associated with. Lifecycle injection APIs can only be used during execution of setup(). If you are using async setup(), make sure to register lifecycle hooks before the first await statement. 
  at <Anonymous gql= Object show-browsers=false > 
  at <Anonymous key=0 gql= Object show-browsers=false  ... > 
  at <Anonymous> 
  at <Anonymous> 
  at <App>

Fix

One cannot define a new computed inside of a computed property.
Don't use composables directly inside a computed.

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[cypress]

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Test summary

8456 • 1 • 100 • 4 • 1

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Run details

Project	cypress
Status	Failed
Commit	7d88dc1
Started	Nov 18, 2021 11:35 PM
Ended	Nov 18, 2021 11:46 PM
Duration	11:35 💡
OS	Linux Debian - 10.9
Browser	Multiple

View run in Cypress Dashboard ➡️

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Failures

	cypress/integration/commands/net_stubbing_spec.ts		1
1	network stubbing > intercepting request > should delay the same amount on every response

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Flakiness

	cypress/integration/commands/net_stubbing_spec.ts		1
1	network stubbing > waiting and aliasing > can timeout waiting on a single request using "alias.request"

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