fix(X11): CS0472 The result of the expression is always 'false'

[workgroupengineering]

What does the pull request do?

What is the current behavior?

Because following condition never be true

Avalonia/src/Avalonia.X11/Screens/X11Screens.Scaling.cs

Line 200 in e40d5d6

if (globalFactorString == null && screenFactorsString == null && usePhysicalDpi == null)

GetScalingProvider' always return UserConfiguredScalingProvider`

Avalonia/src/Avalonia.X11/Screens/X11Screens.Scaling.cs

Lines 236 to 241 in e40d5d6

	if (config != null)
	provider = new UserConfiguredScalingProvider(config.NamedConfig, config.IndexedConfig);
	else if (forceAuto)
	provider = new PhysicalDpiScalingProvider();
	else
	provider = new XrdbScalingProvider(platform);

What is the updated/expected behavior with this PR?

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

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues