### 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
Char cs = utf8();
	unsigned char hash[20];
	CryptoCore::sha1((unsigned char *)cs.ptr(), cs.length(), hash);
	return ::hex_encode_buffer(hash, 20);
}
 ::sha256_text() const {
	Char cs = utf8();
	unsigned char hash[32];
	CryptoCore::sha256((unsigned char *)cs.ptr(), cs.length(), hash);
	return ::hex_encode_buffer(hash, 32);
}
Vector<uint8_t> ::md5_buffer() const {
	Char cs = utf8();
	unsigned char hash[16];
	CryptoCore::md5((unsigned char *)cs.ptr(), cs.length(), hash);
	Vector<uint8_t> ret;
	ret.resize(16);
	for (int i = 0; i < 16; i++) {
		ret.write[i] = hash[i];
	}
	return ret;
}
Vector<uint8_t> ::sha1_buffer() const {
	Char cs = utf8();
	unsigned char hash[20];
	CryptoCore::sha1((unsigned char *)cs.ptr(), cs.length(), hash);
	Vector<uint8_t> ret;
	ret.resize(20);
	for (int i = 0; i < 20; i++) {
		ret.write[i] = hash[i];