### 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>();
	}
	Vector<uint8_t> retval;
	size_t len = s->length() * sizeof(char32_t);
	retval.resize(len);
	uint8_t *w = retval.ptrw();
	memcpy(w, (const void *)s->ptr(), len);
	return retval;
}
Vector<uint8_t> ::to_wchar_buffer() const {
#ifdef WINDOWS_ENABLED
	return to_utf16_buffer();
#else
	return to_utf32_buffer();
#endif
}
#ifdef TOOLS_ENABLED
/**
 * "Tools TRanslate". Performs string replacement for internationalization
 * within the editor. A translation context can optionally be specified to
 * disambiguate between identical source strings in translations. When
 * placeholders are desired, use `vformat(TTR("Example: %s"), some_string)`.
 * If a string mentions a quantity (and may therefore need a dynamic plural form),