Fix: Handle rolling events.

[sealoyal2018]

What does the pull request do?

Handle rolling events accurately.

What is the current behavior?

Pressing any key while scrolling the mouse will scroll (excluding the normal Shift key - horizontal scrolling).

What is the updated/expected behavior with this PR?

Handle scroll events when no keyboard keys are pressed, and handle other keyboard + mouse wheel events externally, such as zooming (excluding normal Shift key - horizontal scrolling)

[avaloniaui-bot]

You can test this PR using the following package version. 11.3.999-cibuild0052463-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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[sealoyal2018]

@cla-avalonia agree

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