Fix: respect CanResize on macOS regardless of SystemDecorations

[BAndysc]

What does the pull request do?

This PR moves NSWindowStyleMaskResizable flag application from SystemDecorationsFull case outside of the switch, so this flag is applied also for other system decorations.

What is the current behavior?

NSWindowStyleMaskResizable is applied only for SystemDecorationsFull. Other decorations make windows not resizable.

What is the updated/expected behavior with this PR?

NSWindowStyleMaskResizable is applied regardless of SystemDecorations, it always follows CanResize property.

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Windows which have decorations set to None or BorderOnly and CanResize=true (default) will now become resizable, which can be unexpected for some people. But this behaviour is expected since CanResize is set to true, isn't it?

Obsoletions / Deprecations

Fixed issues

Fixes #17295

[avaloniaui-bot]

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[avaloniaui-bot]

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[avaloniaui-bot]

You can test this PR using the following package version. 11.3.999-cibuild0052826-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[avaloniaui-bot]

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[avaloniaui-bot]

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