LibWeb: Don't override prototype on generated iterator prototypes

Generated iterator prototypes already have the IteratorPrototype as
their prototype, but we were incorrectly hijacking them and rerouting
to ObjectPrototype.

Regressed in cfe663435ed0780440e52bc66d69d787f6c0af2f.

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -3881,25 +3881,6 @@ JS::ThrowCompletionOr<void> @prototype_class@::initialize(JS::Realm& realm)
 {
     auto& vm = this->vm();
     MUST_OR_THROW_OOM(Base::initialize(realm));
-
-)~~~");
-
-    if (interface.prototype_base_class == "ObjectPrototype") {
-        generator.append(R"~~~(
-
-    set_prototype(realm.intrinsics().object_prototype());
-
-)~~~");
-    } else {
-        generator.append(R"~~~(
-
-    set_prototype(&ensure_web_prototype<@prototype_base_class@>(realm, "@parent_name@"));
-
-)~~~");
-    }
-
-    generator.append(R"~~~(
-
     define_native_function(realm, vm.names.next, next, 0, JS::Attribute::Writable | JS::Attribute::Enumerable | JS::Attribute::Configurable);
     define_direct_property(vm.well_known_symbol_to_string_tag(), MUST_OR_THROW_OOM(JS::PrimitiveString::create(vm, "Iterator"sv)), JS::Attribute::Configurable);
 

Tests/LibWeb/Text/expected/url-search-params-iterator-iterator.txt

@@ -0,0 +1,6 @@
+[object Iterator]
+[object Iterator]
+true
+hello
+1
+[object Window]

Tests/LibWeb/Text/input/url-search-params-iterator-iterator.html

@@ -0,0 +1,13 @@
+<script src="include.js"></script>
+<script>
+    test(() => {
+        let u = new URLSearchParams();
+        let iterator = u[Symbol.iterator]();
+        println(iterator);
+        println(iterator[Symbol.iterator]());
+        println(iterator === iterator[Symbol.iterator]());
+        println(iterator[Symbol.iterator].call("hello"));
+        println(iterator[Symbol.iterator].call(1));
+        println(iterator[Symbol.iterator].call(window));
+    });
+</script>