Minor code style tweaks

Author: Sergio0694

Microsoft.Toolkit.Mvvm.SourceGenerators/ComponentModel/ObservableValidatorValidateAllPropertiesGenerator.SyntaxReceiver.cs

@@ -32,8 +32,7 @@ private sealed class SyntaxReceiver : ISyntaxContextReceiver
             public void OnVisitSyntaxNode(GeneratorSyntaxContext context)
             {
                 if (context.Node is ClassDeclarationSyntax classDeclaration &&
-                    context.SemanticModel.GetDeclaredSymbol(classDeclaration) is INamedTypeSymbol classSymbol &&
-                    !classSymbol.IsGenericType &&
+                    context.SemanticModel.GetDeclaredSymbol(classDeclaration) is INamedTypeSymbol { IsGenericType: false } classSymbol &&
                     context.SemanticModel.Compilation.GetTypeByMetadataName("Microsoft.Toolkit.Mvvm.ComponentModel.ObservableValidator") is INamedTypeSymbol validatorSymbol &&
                     classSymbol.InheritsFrom(validatorSymbol))
                 {

Microsoft.Toolkit.Mvvm.SourceGenerators/ComponentModel/TransitiveMembersGenerator.SyntaxReceiver.cs

@@ -31,8 +31,7 @@ private sealed class SyntaxReceiver : ISyntaxContextReceiver
             /// <inheritdoc/>
             public void OnVisitSyntaxNode(GeneratorSyntaxContext context)
             {
-                if (context.Node is ClassDeclarationSyntax classDeclaration &&
-                    classDeclaration.AttributeLists.Count > 0 &&
+                if (context.Node is ClassDeclarationSyntax { AttributeLists: { Count: > 0 } } classDeclaration &&
                     context.SemanticModel.GetDeclaredSymbol(classDeclaration) is INamedTypeSymbol classSymbol &&
                     context.SemanticModel.Compilation.GetTypeByMetadataName(typeof(TAttribute).FullName) is INamedTypeSymbol attributeSymbol &&
                     classSymbol.GetAttributes().FirstOrDefault(a => SymbolEqualityComparer.Default.Equals(a.AttributeClass, attributeSymbol)) is AttributeData attributeData &&

Microsoft.Toolkit.Mvvm.SourceGenerators/Messaging/IMessengerRegisterAllGenerator.SyntaxReceiver.cs

@@ -32,8 +32,7 @@ private sealed class SyntaxReceiver : ISyntaxContextReceiver
             public void OnVisitSyntaxNode(GeneratorSyntaxContext context)
             {
                 if (context.Node is ClassDeclarationSyntax classDeclaration &&
-                    context.SemanticModel.GetDeclaredSymbol(classDeclaration) is INamedTypeSymbol classSymbol &&
-                    !classSymbol.IsGenericType &&
+                    context.SemanticModel.GetDeclaredSymbol(classDeclaration) is INamedTypeSymbol { IsGenericType: false } classSymbol &&
                     context.SemanticModel.Compilation.GetTypeByMetadataName("Microsoft.Toolkit.Mvvm.Messaging.IRecipient`1") is INamedTypeSymbol iRecipientSymbol &&
                     classSymbol.AllInterfaces.Any(i => SymbolEqualityComparer.Default.Equals(i.OriginalDefinition, iRecipientSymbol)))
                 {