UI: Fix crash when hiding audio mixer item

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This crash is suspected to be a QT bug that happens in 6.2.4, as
it only happens in this version. This is the QT version that is in
the Ubuntu 22.04 ppa, so this fix is a necessary evil as it affects
Ubuntu users.

This fixes the crash by deferring the hiding of the audio mixer
item to the next event loop.

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500 Internal Server Error

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