### 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)

// 
					TypedArray<RegExMatch> reg_match = reg_container.class_regexes[current_index]->search_all(line);
					if (reg_match.size() > 0) {
						found_renames.append(line_formatter(current_line, RenamesMap3To4::class_renames[current_index][0], RenamesMap3To4::class_renames[current_index][1], old_line));
					}
					// 
					if (found_ignored_items) {
						line = reg_container.class_temp_tscn.sub(line, reg_container.class_temp_tscn_renames[current_index], true);
						line = reg_container.class_temp_gd.sub(line, reg_container.class_temp_gd_renames[current_index], true);
						line = reg_container.class_temp_shader.sub(line, reg_container.class_temp_shader_renames[current_index], true);
					}
				}
			}
		}
		current_line++;
	}
	return found_renames;
}
void ProjectConverter3To4::rename_gdscript_functions(Vector<SourceLine> &source_lines, const RegExContainer &reg_container, bool builtin) {
	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) {
			process_gdscript_line(line, reg_container, builtin);
		}
	}
};
Vector<String> ProjectConverter3To4::check_for_rename_gdscript_functions(Vector<String> &lines, const RegExContainer &reg_container, bool builtin) {