### 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)

line = reg_container.reg_setget_set.sub(line, "var $1$2: set = $3", true);
	}
	// 
	if (line.contains("setget")) {
		line = reg_container.reg_setget_get.sub(line, "var $1$2: get = $3", true);
	}
	if (line.contains("window_resizable")) {
		// 
		line = reg_container.reg_os_set_window_resizable.sub(line, "get_window().unresizable = not ($1)", true);
		// 
		line = reg_container.reg_os_assign_window_resizable.sub(line, "get_window().unresizable = not ($1)", true);
		// 
		line = reg_container.reg_os_is_window_resizable.sub(line, "(not get_window().unresizable)", true);
	}
	if (line.contains("window_fullscreen")) {
		// 
		line = reg_container.reg_os_set_fullscreen.sub(line, "get_window().mode = Window.MODE_EXCLUSIVE_FULLSCREEN if ($1) else Window.MODE_WINDOWED", true);
		// 
		line = reg_container.reg_os_assign_fullscreen.sub(line, "get_window().mode = Window.MODE_EXCLUSIVE_FULLSCREEN if ($1) else Window.MODE_WINDOWED", true);
		// 
		line = reg_container.reg_os_is_fullscreen.sub(line, "((get_window().mode == Window.MODE_EXCLUSIVE_FULLSCREEN) or (get_window().mode == Window.MODE_FULLSCREEN))", true);
	}
	if (line.contains("window_maximized")) {
		// 
		line = reg_container.reg_os_set_maximized.sub(line, "get_window().mode = Window.MODE_MAXIMIZED if ($1) else Window.MODE_WINDOWED", true);
		// 
		line = reg_container.reg_os_assign_maximized.sub(line, "get_window().mode = Window.MODE_MAXIMIZED if ($1) else Window.MODE_WINDOWED", true);
		// 
		line = reg_container.reg_os_is_maximized.sub(line, "(get_window().mode == Window.MODE_MAXIMIZED)", true);
	}