### 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.keyword_gdscript_tool.sub(line, "@onready", true);
				if (old != line) {
					found_renames.append(line_formatter(current_line, "onready", "@onready", line));
				}
			}
			if (line.contains("remote")) {
				old = line;
				line = reg_container.keyword_gdscript_remote.sub(line, builtin_escape("@rpc(\"any_peer\") func", builtin), true);
				if (old != line) {
					found_renames.append(line_formatter(current_line, "remote func", builtin_escape("@rpc(\"any_peer\") func", builtin), line));
				}
			}
			if (line.contains("remote")) {
				old = line;
				line = reg_container.keyword_gdscript_remotesync.sub(line, builtin_escape("@rpc(\"any_peer\", \"call_local\")) func", builtin), true);
				if (old != line) {
					found_renames.append(line_formatter(current_line, "remotesync func", builtin_escape("@rpc(\"any_peer\", \"call_local\")) func", builtin), line));
				}
			}
			if (line.contains("sync")) {
				old = line;
				line = reg_container.keyword_gdscript_sync.sub(line, builtin_escape("@rpc(\"any_peer\", \"call_local\")) func", builtin), true);
				if (old != line) {
					found_renames.append(line_formatter(current_line, "sync func", builtin_escape("@rpc(\"any_peer\", \"call_local\")) func", builtin), line));
				}
			}
			if (line.contains("slave")) {
				old = line;
				line = reg_container.keyword_gdscript_slave.sub(line, "@rpc func", true);
				if (old != line) {