Better detection of when the captcha is open.

Old version didn't detect the noscript version that sometimes comes up.
Fix update bugs when Auto Scroll is enabled.

Bug was introduced by commit c38c37c7200f208699fd9dce62f557b1185bfd3a.
captcha-section -> captcha-root
Fix unwanted captcha loads.
Focus on the submit button after captcha completion, unless dumping and more captchas are needed.
Need more captchas or captcha error -> focus on captcha iframe
Release 4chan X v1.9.14.6.
Move 4chan X v1.9.14.6 to stable channel.