### 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
const  *s = this;
	if (s->is_empty()) {
		return Vector<uint8_t>();
	}
	Char charstr = s->utf8();
	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_utf16_buffer() const {
	const  *s = this;
	if (s->is_empty()) {
		return Vector<uint8_t>();
	}
	Char16 charstr = s->utf16();
	Vector<uint8_t> retval;
	size_t len = charstr.length() * sizeof(char16_t);
	retval.resize(len);
	uint8_t *w = retval.ptrw();
	memcpy(w, (const void *)charstr.ptr(), len);
	return retval;
}
Vector<uint8_t> ::to_utf32_buffer() const {