CalendarDatePicker does not support light dismiss in simple theme

[tvass83]

Describe the bug

By default, CalendarDatePicker's dropdown won't close when clicking outside its bounds when using Avalonia's simple theme.

I believe this is a regression between 0.10.22 vs 11.x, introduced here:
00c0823#diff-0511907109f114545e18d756f0b26d60d7785744ae6cd1e952eee4ec8f2249c5L121-R121

Simple theme style:

Avalonia/src/Avalonia.Themes.Simple/Controls/CalendarDatePicker.xaml

Lines 119 to 121 in 151d97a

	<Popup Name="PART_Popup"
	PlacementTarget="{TemplateBinding}"
	IsLightDismissEnabled="False">

Fluent theme style is correct:

Avalonia/src/Avalonia.Themes.Fluent/Controls/CalendarDatePicker.xaml

Lines 125 to 127 in 151d97a

	<Popup Name="PART_Popup"
	PlacementTarget="{TemplateBinding}"
	IsLightDismissEnabled="True">

Workaround:
Override the default control template or use a style trigger to override the underlying Popup's IsLightDismissEnabled property.

To Reproduce

1. Use simple theme
2. Open dropdown of CalendarDatePicker
3. Try to close the dropdown by clicking outside its visual bounds

Expected behavior

The dropdown shall be closed when clicking outside its visual bounds

Avalonia version

11.2.3

OS

No response

Additional context

No response

[MrJul]

Yes, this sounds like a mistake introduced when StaysOpen was removed, the boolean needed to be reversed.
A PR would be welcome :)