update avalonia with x11 fixes.
MODIFY
Directory.Build.targets
Directory.Build.targets
<Project>
<PropertyGroup>
- <AvaloniaVersion>0.7.1-build1286-beta</AvaloniaVersion>
+ <AvaloniaVersion>0.7.1-cibuild0001324-beta</AvaloniaVersion>
<AvaloniaBehaviorsVersion>0.7.0</AvaloniaBehaviorsVersion>
</PropertyGroup>

MODIFY
WalletWasabi.Dependencies/AvalonStudio.Shell
WalletWasabi.Dependencies/AvalonStudio.Shell
-Subproject commit 56cae3909935c83973bcb7e3810cf3b635110c3d
+Subproject commit b6870d7ef6260f6c7830610398b0056d83dac3e7

update avalonia with x11 fixes.