Fix IActivatableLifetime.Deactivated not being called on macOS

[JamesSmith85]

Fixes #17561

Suggestion of @maxkatz6. (Not tested)

[avaloniaui-bot]

You can test this PR using the following package version. 11.3.999-cibuild0053483-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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[JamesSmith85]

@JamesSmith85,

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[maxkatz6]

Tested. Thanks.