LibJS: Remove Object(Object& prototype) footgun

This constructor was easily confused with a copy constructor, and it was
possible to accidentally copy-construct Objects in at least one way that
we dicovered (via generic ThrowCompletionOr construction).

This patch adds a mandatory ConstructWithPrototypeTag parameter to the
constructor to disambiguate it.

Userland/Libraries/LibJS/Runtime/JSONObject.cpp

@@ -27,7 +27,7 @@
 namespace JS {
 
 JSONObject::JSONObject(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }