[Bug]: AvaloniaScheduler does not yield to UI thread if dueTime specified

[deryaza]

Describe the bug 🐞

This commit AvaloniaUI/Avalonia#20957 changed behaviour of DispatchTimer, now it runs on current thread dispatcher, and not on UI dispatcher which breaks Throttle with AvaloniaScheduler specified for example

Step to reproduce

Create a simple app and use Throttle with RxSchedulers.MainThreadScheduler

Reproduction repository

https://github.com/reactiveui/ReactiveUI

Expected behavior

Throttle callback should happen on the UI thread

Screenshots 🖼️

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IDE

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Operating system

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Version

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Device

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ReactiveUI.Avalonia Version

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Additional information ℹ️

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