Fix SelectableTextBlock Selection

[xLEGiON]

What does the pull request do?

Fixes #15515.

What is the current behavior?

Double click to select a word. Then a single click on that word does not reset the selection.

What is the updated/expected behavior with this PR?

The selection is reset during the single click.

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

The same issue for the TextBox control #11390 was fixed by #11294. The relevant code change from that PR was made to SelectableTextBlock.

My environment isn't currently set up to build Avalonia from source, so this needs to be tested.

Fixed issues

Fixes #15515

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0047828-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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Just adding that I managed to get this tested using the package provided by the bot above and the fix worked for me as expected.