### 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 (old_line.size() > 1000) {
		old_line = old_line.substr(0, 997) + "...";
	}
	if (new_line.size() > 1000) {
		new_line = new_line.substr(0, 997) + "...";
	}
	old_line = old_line.replace("\r", "").replace("\n", "").strip_edges();
	new_line = new_line.replace("\r", "").replace("\n", "").strip_edges();
	return vformat("Line (%d) - FULL LINES - \"\"\" %s \"\"\"  =====>  \"\"\" %s \"\"\"", current_line, old_line, new_line);
}
// Collects string from vector strings
String ProjectConverter3To4::collect_string_from_vector(Vector<SourceLine> &vector) {
	String string = "";
	for (int i = 0; i < vector.size(); i++) {
		string += vector[i].line;
		if (i != vector.size() - 1) {
			string += "\n";
		}
	}
	return string;
}
#endif // 
#endif //