### 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
#ifdef WINDOWS_ENABLED
	
	parse_utf16((const char16_t *)p_cstr, p_clip_to);
#else
	
	copy_from((const char32_t *)p_cstr, p_clip_to);
#endif
}
void ::copy_from(const char32_t &p_char) {
	if (p_char == 0) {
		print_unicode_error("NUL character", true);
		return;
	}
	resize(2);
	char32_t *dst = ptrw();
	if ((p_char & 0xfffff800) == 0xd800) {
		print_unicode_error(vformat("Unpaired surrogate (%x)", (uint32_t)p_char));
		dst[0] = _replacement_char;
	} else if (p_char > 0x10ffff) {
		print_unicode_error(vformat("Invalid unicode codepoint (%x)", (uint32_t)p_char));
		dst[0] = _replacement_char;
	} else {
		dst[0] = p_char;
	}
	dst[1] = 0;
}
void ::copy_from(const char32_t *p_cstr) {