### 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)

for (RegEx *regex : color_regexes) {
			memdelete(regex);
		}
		for (unsigned int i = 0; i < class_tscn_regexes.size(); i++) {
			memdelete(class_tscn_regexes[i]);
			memdelete(class_gd_regexes[i]);
			memdelete(class_shader_regexes[i]);
			memdelete(class_regexes[i]);
		}
		for (RegEx *regex : enum_regexes) {
			memdelete(regex);
		}
		for (RegEx *regex : gdscript_function_regexes) {
			memdelete(regex);
		}
		for (RegEx *regex : project_settings_regexes) {
			memdelete(regex);
		}
		for (RegEx *regex : project_godot_regexes) {
			memdelete(regex);
		}
		for (RegEx *regex : input_map_regexes) {
			memdelete(regex);
		}
		for (RegEx *regex : gdscript_properties_regexes) {