Make delete API consistent for String objects

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 125a31be06f94b802e9f61a465335ee641b8c189..cf054147ac979786e2d621881ddf85a82a364252 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3481,7 +3481,7 @@ i::MaybeHandle<i::Object> DeleteObjectProperty(
     // underlying string does nothing with the deletion, we can ignore
     // such deletions.
     if (receiver->IsStringObjectWithCharacterAt(index)) {
-      return isolate->factory()->true_value();
+      return isolate->factory()->false_value();
     }
 
     return i::JSReceiver::DeleteElement(receiver, index, language_mode);