### 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)

rename_common(RenamesMap3To4::gdscript_function_renames, reg_container.gdscript_function_regexes, source_lines);
				rename_gdscript_functions(source_lines, reg_container, false); 
				rename_common(RenamesMap3To4::project_settings_renames, reg_container.project_settings_regexes, source_lines);
				rename_gdscript_keywords(source_lines, reg_container, false);
				rename_common(RenamesMap3To4::gdscript_properties_renames, reg_container.gdscript_properties_regexes, source_lines);
				rename_common(RenamesMap3To4::gdscript_signals_renames, reg_container.gdscript_signals_regexes, source_lines);
				rename_common(RenamesMap3To4::shaders_renames, reg_container.shaders_regexes, source_lines);
				rename_common(RenamesMap3To4::builtin_types_renames, reg_container.builtin_types_regexes, source_lines);
				rename_common(RenamesMap3To4::theme_override_renames, reg_container.theme_override_regexes, source_lines);
				custom_rename(source_lines, "\\.shader", ".gdshader");
			} else if (file_name.ends_with(".tscn")) {
				rename_classes(source_lines, reg_container); 
				rename_common(RenamesMap3To4::enum_renames, reg_container.enum_regexes, source_lines);
				rename_colors(source_lines, reg_container); 
				rename_common(RenamesMap3To4::gdscript_function_renames, reg_container.gdscript_function_regexes, source_lines);
				rename_gdscript_functions(source_lines, reg_container, true); 
				rename_common(RenamesMap3To4::project_settings_renames, reg_container.project_settings_regexes, source_lines);
				rename_gdscript_keywords(source_lines, reg_container, true);
				rename_common(RenamesMap3To4::gdscript_properties_renames, reg_container.gdscript_properties_regexes, source_lines);
				rename_common(RenamesMap3To4::gdscript_signals_renames, reg_container.gdscript_signals_regexes, source_lines);
				rename_common(RenamesMap3To4::shaders_renames, reg_container.shaders_regexes, source_lines);
				rename_common(RenamesMap3To4::builtin_types_renames, reg_container.builtin_types_regexes, source_lines);
				rename_common(RenamesMap3To4::theme_override_renames, reg_container.theme_override_regexes, source_lines);
				custom_rename(source_lines, "\\.shader", ".gdshader");
			} else if (file_name.ends_with(".cs")) { 
				rename_classes(source_lines, reg_container); 
				rename_common(RenamesMap3To4::csharp_function_renames, reg_container.csharp_function_regexes, source_lines);
				rename_common(RenamesMap3To4::builtin_types_renames, reg_container.builtin_types_regexes, source_lines);
				rename_common(RenamesMap3To4::csharp_properties_renames, reg_container.csharp_properties_regexes, source_lines);
				rename_common(RenamesMap3To4::csharp_signals_renames, reg_container.csharp_signal_regexes, source_lines);