update avalonia and shell with critical fixes.
MODIFY
Directory.Build.targets
Directory.Build.targets
<Project>
<PropertyGroup>
- <AvaloniaVersion>0.7.0-build429-beta</AvaloniaVersion>
+ <AvaloniaVersion>0.7.0-build431-beta</AvaloniaVersion>
<AvaloniaBehaviorsVersion>0.6.2-build562</AvaloniaBehaviorsVersion>
</PropertyGroup>

MODIFY
WalletWasabi.Dependencies/AvalonStudio.Shell
WalletWasabi.Dependencies/AvalonStudio.Shell
-Subproject commit 8e5a8c9c2121a472839aac1922be4ebee2dd3452
+Subproject commit d8fa24793b4b77b45d0b28fb3ff5201fdce6373b

update avalonia and shell with critical fixes.