Js frontend: prohibit default values for functions annotated as nativeIndexer.

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeGetter/onLocalNonNativeClassMembers.kt

@@ -38,5 +38,8 @@ fun foo() {
 
         <!NATIVE_ANNOTATIONS_ALLOWED_ONLY_ON_MEMBER_OR_EXTENSION_FUN!>nativeGetter
         fun bar(a: String): <!NATIVE_GETTER_RETURN_TYPE_SHOULD_BE_NULLABLE!>Int<!><!> = 0
+
+        <!NATIVE_ANNOTATIONS_ALLOWED_ONLY_ON_MEMBER_OR_EXTENSION_FUN!>nativeGetter
+        fun baz(<!NATIVE_INDEXER_CAN_NOT_HAVE_DEFAULT_ARGUMENTS!>a: Int = 0<!>): Int?<!> = 0
     }
 }