### 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("to_json")) {
		line = reg_container.reg_json_to.sub(line, "JSON.new().stringify", true);
	}
	// 
	if (line.contains("parse_json")) {
		line = reg_container.reg_json_parse.sub(line, "$1var test_json_conv = JSON.new()\n$1test_json_conv.parse($3\n$1$2test_json_conv.get_data()", true);
	}
	// 
	if (line.contains("JSON.print(")) {
		line = reg_container.reg_json_print.sub(line, "JSON.stringify(", true);
	}
	// 
	if (line.contains("get_node")) {
		line = line.replace("get_node(@", "get_node(");
	}
	// 
	if (line.contains("export")) {
		line = reg_container.reg_export.sub(line, "export var $2: $1");
	}
	// 
	if (line.contains("export")) {
		line = reg_container.reg_export_advanced.sub(line, "export var $2$3 # ($1)");
	}
	// 
	if (line.contains("setget")) {
		line = reg_container.reg_setget_setget.sub(line, "var $1$2: get = $4, set = $3", true);
	}
	// 
	if (line.contains("setget")) {