### 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_csharp_remotesync.sub(line, "[RPC(MultiplayerAPI.RPCMode.AnyPeer, CallLocal = true)]", true);
			if (old != line) {
				found_renames.append(line_formatter(current_line, "[RemoteSync]", "[RPC(MultiplayerAPI.RPCMode.AnyPeer, CallLocal = true)]", line));
			}
			old = line;
			line = reg_container.keyword_csharp_puppet.sub(line, "[RPC]", true);
			if (old != line) {
				found_renames.append(line_formatter(current_line, "[Puppet]", "[RPC]", line));
			}
			old = line;
			line = reg_container.keyword_csharp_puppetsync.sub(line, "[RPC(CallLocal = true)]", true);
			if (old != line) {
				found_renames.append(line_formatter(current_line, "[PuppetSync]", "[RPC(CallLocal = true)]", line));
			}
			old = line;
			line = reg_container.keyword_csharp_master.sub(line, "[RPC]", true);
			if (old != line) {
				found_renames.append(line_formatter(current_line, "[Master]", "[RPC]", line));
			}
			old = line;
			line = reg_container.keyword_csharp_mastersync.sub(line, "[RPC(CallLocal = true)]", true);
			if (old != line) {
				found_renames.append(line_formatter(current_line, "[MasterSync]", "[RPC(CallLocal = true)]", line));
			}
		}
		current_line++;
	}
	return found_renames;
}
_FORCE_INLINE_ static String builtin_escape(const String &p_str, bool p_builtin) {