### Godot version

4.1.1

### System information

linux

### Issue description

The `"%+f"` format adds a `+` sign in front of positive numbers. If you try to format `-0.0`, it breaks and displays both a `+` and a `-`.

### Steps to reproduce

```gdscript
@tool
extends EditorScript

func _run() -> void:
    print("%+f" % -0.0)
```

### Minimal reproduction project

see above
return quotechar + *this + quotechar;
}
 ::unquote() const {
	if (!is_quoted()) {
		return *this;
	}
	return substr(1, length() - 2);
}
Vector<uint8_t> ::to_ascii_buffer() const {
	const  *s = this;
	if (s->is_empty()) {
		return Vector<uint8_t>();
	}
	Char charstr = s->ascii();
	Vector<uint8_t> retval;
	size_t len = charstr.length();
	retval.resize(len);
	uint8_t *w = retval.ptrw();
	memcpy(w, charstr.ptr(), len);
	return retval;
}
Vector<uint8_t> ::to_utf8_buffer() const {