### Godot version

4.0-rc1

### System information

Windows 10

### Issue description

The code: `@export @onready var camera_system : Node3D`

Is throwing: `Line 5:The "@onready" annotation will make the default value to be set after the "@export" takes effect and will override it. (Warning treated as error.)` and is crashing the game.

Unchecking "Treat Warning as Errors" seems to have no effect:

![imagen](https://user-images.githubusercontent.com/248383/217900756-8e214c40-68fb-4fb2-8509-a1e689725930.png)

![imagen](https://user-images.githubusercontent.com/248383/217901253-3b758ebc-48e9-40fe-8d77-16fce7cbae88.png)


### Steps to reproduce

- Write `@export @onready var some_var : Node3D`
- In Project Settings, uncheck `Treat Warning as Errors`
- Try to run the project, a `Parser Error` will be thrown.

### Minimal reproduction project

It's as simple as adding one line of code, so I'm not sure a MRP is needed.
break;
				}
				decided_style = true;
			}
			switch (dictionary->style) {
				case DictionaryNode::LUA_TABLE:
					if (key != nullptr && key->type != Node::IDENTIFIER && key->type != Node::LITERAL) {
						push_error("Expected identifier or string as LUA-style dictionary key.");
						advance();
						break;
					}
					if (key != nullptr && key->type == Node::LITERAL && static_cast<LiteralNode *>(key)->value.get_type() != Variant::STRING) {
						push_error("Expected identifier or string as LUA-style dictionary key.");
						advance();
						break;
					}
					if (!match(GDScriptTokenizer::Token::EQUAL)) {
						if (match(GDScriptTokenizer::Token::COLON)) {
							push_error(R"(Expected "=" after dictionary key. Mixing dictionary styles is not allowed.)");
							advance(); 
						} else {
							push_error(R"(Expected "=" after dictionary key.)");
						}
					}
					if (key != nullptr) {
						key->is_constant = true;
						if (key->type == Node::IDENTIFIER) {
							key->reduced_value = static_cast<IdentifierNode *>(key)->name;
						} else if (key->type == Node::LITERAL) {
							key->reduced_value = StringName(static_cast<LiteralNode *>(key)->value.operator String());