### 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)

// 
	// 
	if ((line.contains(".lock") || line.contains(".unlock")) && !line.contains("mtx") && !line.contains("mutex") && !line.contains("Mutex")) {
		line = reg_container.reg_image_lock.sub(line, "false # $1.lock() # TODOConverter40, Image no longer requires locking, `false` helps to not break one line if/else, so it can freely be removed", true);
		line = reg_container.reg_image_unlock.sub(line, "false # $1.unlock() # TODOConverter40, Image no longer requires locking, `false` helps to not break one line if/else, so it can freely be removed", true);
	}
	// 
	if (line.contains(".join")) {
		line = reg_container.reg_join.sub(line, "$2.join($1)", true);
	}
	// 
	if (line.contains("empty")) {
		line = reg_container.reg_is_empty.sub(line, "is_empty(", true);
	}
	// 
	if (line.contains("(") && line.contains(".")) {
		line = reg_container.reg_super.sub(line, "$1super.$2", true); // 
	}
	// 
	if (line.contains("parse")) {
		line = reg_container.reg_json_non_new.sub(line, "$1var test_json_conv = JSON.new()\n$1test_json_conv.parse($3\n$1$2test_json_conv.get_data()", true);
	}