Rearrange the code a bit for duplicate method detections.

test/language/method/duplicate_methods.wren

@@ -2,10 +2,11 @@ class Foo {
   construct new() {}
   foo() {}
   foo() {} // expect error
-  
+
   static bar() {}
   static bar() {} // expect error
-  
+
+  // No error on instance and static method with same signature.
   baz() {}
   static baz() {}
 }