### 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
// and the same second as "ÿ" (\u00ff)
	STRIP_TEST(String::utf8("¿").lstrip(String::utf8("µÿ")) == String::utf8("¿"));
	STRIP_TEST(String::utf8("¿").rstrip(String::utf8("µÿ")) == String::utf8("¿"));
	STRIP_TEST(String::utf8("µ¿ÿ").lstrip(String::utf8("µÿ")) == String::utf8("¿ÿ"));
	STRIP_TEST(String::utf8("µ¿ÿ").rstrip(String::utf8("µÿ")) == String::utf8("µ¿"));
	// the above tests repeated with additional superfluous strip chars
	
	).lstrip("qwjkl") == "abc");
	).rstrip("qwjkl") == "abc");
	
	).lstrip("qwajkl") == "bc");
	).rstrip("qwcjkl") == "ab");
	
	STRIP_TESTbbababccc").lstrip("qwabjkl") == "ccc");
	STRIP_TEST(String("aaabcbcbcbbcbbc").rstrip("qwcbjkl") == "aaa");
	
	STstrip("qwjkl") == "");
	STRIP_TEST(String("").rstrip("qwjkl") == "");
	
	bcabc").lstrip("qwbcajkl") == "");
	bcabc").rstrip("qwbcajkl") == "");
	
	).lstrip("qwcjkl") == "abc");
	").lstrip("qwajkl") == "bca");
	).rstrip("qwajkl") == "abc");
	").rstrip("qwajkl") == "abc");
	
	// and the same second as "ÿ" (\u00ff)
	STRIP_TEST(String::utf8("¿").lstrip(String::utf8("qwaµÿjkl")) == String::utf8("¿"));
	STRIP_TEST(String::utf8("¿").rstrip(String::utf8("qwaµÿjkl")) == String::utf8("¿"));