### 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)

}
			start--;
			continue;
		} else {
			// 
			variable_start++; // 
			break;
		}
	}
	if (is_valid_nodepath) {
		variable_start = start;
	}
	return line.substr(variable_start, (end - variable_start));
}
void ProjectConverter3To4::rename_colors(Vector<SourceLine> &source_lines, const RegExContainer &reg_container) {
	for (SourceLine &source_line : source_lines) {
		if (source_line.is_comment) {
			continue;
		}
		String &line = source_line.line;
		if (uint64_t(line.length()) <= maximum_line_length) {
			if (line.contains("Color.")) {
				for (unsigned int current_index = 0; RenamesMap3To4::color_renames[current_index][0]; current_index++) {
					line = reg_container.color_regexes[current_index]->sub(line, reg_container.color_renamed[current_index], true);
				}
			}
		}
	}
};
Vector<String> ProjectConverter3To4::check_for_rename_colors(Vector<String> &lines, const RegExContainer &reg_container) {