Fix for Win32Platform ArgumentException when creating WindowIcon from Bitmap

[mihnea-radulescu]

What does the pull request do?

The PR fixes the issue #14541, by extending the Win32Platform correction already provided in this PR.

The other relevant implementations of IPlatformIconLoader in Avalonia.X11.X11IconLoader and Avalonia.Native.IconLoader implement the logic correctly, thus are not affected by the issue.

What is the current behavior?

The Win32Platform implementation of IWindowIconImpl LoadIcon(IBitmapImpl bitmap) throws an ArgumentException.

What is the updated/expected behavior with this PR?

The Win32Platform implementation of IWindowIconImpl LoadIcon(IBitmapImpl bitmap) does not throw an ArgumentException anymore.

How was the solution implemented?

The fix calls the method IconImpl CreateIconImpl(Stream stream), just like the other two LoadIcon() methods in the class Win32Platform.

Fixed issues

Fixes #14541

[avaloniaui-bot]

You can test this PR using the following package version. 11.1.999-cibuild0044667-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[maxkatz6]

Thank you for investigating this issue!
As we found out, this issue was already fixed on master branch in #13445 PR, but by mistake it wasn't including in backporting process from 11.1 to 11.0. Resulting in only first PR being merged with a bug.

I am going to close this PR, as old fix from #13445 PR is going to be backported now.