### 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)

int super_end = line.rfind(")");
		if (super_start > 0 && super_end > super_start) {
			line = line.substr(0, super_start) + line.substr(super_end + 1) + "\n" + String("\t").repeat(indent + 1) + "super" + line.substr(super_start + 1, super_end - super_start);
		}
	}
	//  
	if (contains_function_call(line, "create_from_image(")) {
		int start = line.find("create_from_image(");
		int end = get_end_parenthesis(line.substr(start)) + 1;
		if (end > -1) {
			Vector<String> parts = parse_arguments(line.substr(start, end));
			if (parts.size() == 2) {
				line = line.substr(0, start) + "create_from_image(" + parts[0] + ") " + "#," + parts[1] + line.substr(end + start);
			}
		}
	}
	//  
	if (contains_function_call(line, "set_cell_item(")) {
		int start = line.find("set_cell_item(");
		int end = get_end_parenthesis(line.substr(start)) + 1;
		if (end > -1) {
			Vector<String> parts = parse_arguments(line.substr(start, end));
			if (parts.size() > 2) {
				line = line.substr(0, start) + "set_cell_item(Vector3(" + parts[0] + ", " + parts[1] + ", " + parts[2] + ")" + connect_arguments(parts, 3).lstrip(" ") + ")" + line.substr(end + start);
			}
		}
	}
	//  
	if (contains_function_call(line, "get_cell_item(")) {
		int start = line.find("get_cell_item(");