Suppress SA1202 for RoutedEvent

Fix #366

Author: JohanLarsson

WpfAnalyzers/Suppressors/Sa1202Suppressor.cs

@@ -24,7 +24,8 @@ public override void ReportSuppressions(SuppressionAnalysisContext context)
                 switch (root.FindNode(diagnostic.Location.SourceSpan))
                 {
                     case VariableDeclaratorSyntax { Parent: VariableDeclarationSyntax { Type: { } type } }
-                        when type == KnownSymbols.DependencyProperty:
+                        when type == KnownSymbols.DependencyProperty ||
+                             type == KnownSymbols.RoutedEvent:
                         context.ReportSuppression(Suppression.Create(Descriptor, diagnostic));
                         break;
                     case MethodDeclarationSyntax method