fix: Fix the TouchDevice lost the touch Pressure

[lindexi]

What does the pull request do?

After #15283 , and I can find the touch pressure on X11 platform. But I can not receive the touch pressure from Avalonia.Input.PointerEventArgs. And I find the TouchDevice will lost the touch pressure when create the
PointerPointProperties.

What is the current behavior?

We can not receive the Touch Pressure in Avalonia.Input.PointerEventArgs on X11 platform.

What is the updated/expected behavior with this PR?

We can receive the Touch Pressure in Avalonia.Input.PointerEventArgs on X11 platform.

How was the solution implemented (if it's not obvious)?

I append the RawPointerPoint to PointerPointProperties in TouchDevice in this pull request.

Checklist

• Added unit tests (if possible)? It is hard to write the unit tests.
• Added XML documentation to any related classes? No new public API was introduced.
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

Fixes #3540

[lindexi]

I test this PR and #15283 by my demo code. And I run it in the device with the Touch screen. And I can receive the touch pressure in PointerMoved.

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0047092-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]