LibJS+LibWeb: Convert empty PrimitiveString invocators to String

Author: https://github.com/trflynn89
Commit: 34574c5ee8
Pull-request: https://github.com/SerenityOS/serenity/pull/17122
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/nico

Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormatFunction.cpp

@@ -31,7 +31,7 @@ void DateTimeFormatFunction::initialize(Realm& realm)
 
     Base::initialize(realm);
     define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
-    define_direct_property(vm.names.name, PrimitiveString::create(vm, DeprecatedString::empty()), Attribute::Configurable);
+    define_direct_property(vm.names.name, PrimitiveString::create(vm, String {}), Attribute::Configurable);
 }
 
 ThrowCompletionOr<Value> DateTimeFormatFunction::call()