Fix build

Author: AustinWise

src/coreclr/tools/Common/Internal/Runtime/EETypeBuilderHelpers.cs

@@ -148,7 +148,7 @@ private static bool IsTrackedReferenceWithFinalizer(TypeDesc type)
                 if (!type.HasFinalizer)
                     return false;
 
-                if ((MetadataType)type).HasCustomAttribute("System.Runtime.InteropServices.ObjectiveC", "ObjectiveCTrackedTypeAttribute"))
+                if (((MetadataType)type).HasCustomAttribute("System.Runtime.InteropServices.ObjectiveC", "ObjectiveCTrackedTypeAttribute"))
                     return true;
 
                 type = type.BaseType;