fix: selector option.HasNotText

[hongcha98]

When I use the code below, an error will be thrown
painc: interface conversion: interface {} is nil, not string

locator = locator.Filter(playwright.LocatorFilterOptions{
	HasNotText: "test",
})

I checked the source code and the value obtained here is wrong

	if option.HasNotText != nil {
		selector += fmt.Sprintf(` >> internal:has-not-text=%s`, escapeForTextSelector(option.HasText, false))
	}