### Godot version

4.0.2.stable

### System information

Ubuntu 22.10

### Issue description

This happens when converting a godot3 project to a godot4 project.
Godot3 source
```gdscript
extends Node2D

export(int) var integer := 2
export(Resource) var resource: Resource = null
```

Result
```gdscript
extends Node2D

@export var integer: int := 2
@export var resource: Resource: Resource = null
```

Expected result
```gdscript
extends Node2D

@export var integer := 2
@export var resource: Resource = null
```

If someone can point to where in the code this might be fixed maybe I can fix it myself, sounds like a good first issue.


### Steps to reproduce

Open the given project (or any project really) and convert it to a godot 4 project

### Minimal reproduction project

[Conversion Tool Typing Problem.zip](https://github.com/godotengine/godot/files/11185334/Conversion.Tool.Typing.Problem.zip)

#include "project_converter_3_to_4.h"
#ifndef 
#include "modules/modules_enabled.gen.h" 
#ifdef 
#include "core/error/error_macros.h"
#include "core/io/dir_access.h"
#include "core/io/file_access.h"
#include "core/object/ref_counted.h"
#include "core/os/time.h"
#include "core/templates/hash_map.h"
#include "core/templates/list.h"
#include "editor/renames_map_3_to_4.h"
#include "modules/regex/regex.h"
static String make_regex_gds_os_property_set(String name_set) {
	return String("\\bOS\\.") + name_set + "\\s*\\((.*)\\)";
}
static String make_regex_gds_os_property_assign(String name) {
	return String("\\bOS\\.") + name + "\\s*=\\s*([^#]+)";
}
static String make_regex_gds_os_property_get(String name, String get) {
	return String("\\bOS\\.(") + get + "_)?" + name + "(\\s*\\(\\s*\\))?";
}
class ProjectConverter3To4::RegExContainer {