Fix UseCompatibleSyntax class error message

Author: Robert Holt

Rules/CompatibilityRules/UseCompatibleSyntax.cs

@@ -347,6 +347,7 @@ public override AstVisitAction VisitTypeDefinition(TypeDefinitionAst typeDefinit
 
                 string message = string.Format(
                     CultureInfo.CurrentCulture,
+                    Strings.UseCompatibleSyntaxError,
                     "type definition",
                     "class MyClass { ... } | enum MyEnum { ... }",
                     "3,4");