### 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("OS.get_real_window_size")) {
		line = line.replace("OS.get_real_window_size", "get_window().get_size_with_decorations");
	}
	if (line.contains("OS.is_window_focused")) {
		line = line.replace("OS.is_window_focused", "get_window().has_focus");
	}
	if (line.contains("OS.move_window_to_foreground")) {
		line = line.replace("OS.move_window_to_foreground", "get_window().move_to_foreground");
	}
	if (line.contains("OS.request_attention")) {
		line = line.replace("OS.request_attention", "get_window().request_attention");
	}
	if (line.contains("OS.set_window_title")) {
		line = line.replace("OS.set_window_title", "get_window().set_title");
	}
	// 
	if (line.contains("get_tree().set_input_as_handled()")) {
		line = line.replace("get_tree().set_input_as_handled()", "get_viewport().set_input_as_handled()");
	}
	// 
	// 
	if (line.contains("_unhandled_key_input(event: InputEventKey)")) {
		line = line.replace("_unhandled_key_input(event: InputEventKey)", "_unhandled_key_input(event: InputEvent)");
	}
	if (line.contains("Engine.editor_hint")) {
		line = line.replace("Engine.editor_hint", "Engine.is_editor_hint()");
	}
}
void ProjectConverter3To4::process_csharp_line(String &line, const RegExContainer &reg_container) {