Broken display and verification of reCAPTCHA v3 and Invisible hCaptcha

[dvz]

The CAPTCHA identifiers at

• mybb/inc/class_captcha.php

  Line 138 in 017922b

  elseif($this->type == captcha::HCAPTCHA_INVISIBLE)

• mybb/inc/class_captcha.php

  Line 327 in 017922b

  elseif($this->type == captcha::HCAPTCHA_INVISIBLE)

  
  incorrectly point to captcha::HCAPTCHA_INVISIBLE, instead of captcha::RECAPTCHA_V3.

These result in:

• the wrong template being used for reCAPTCHA v3 and a broken Image Verification prompt, and the possibility to bypass the CAPTCHA system when reCAPTCHA v3 is used
• the wrong handler used for verification of hCaptcha's Invisible Captcha (hCaptcha invisible), and rejection of all challenges for that system.

Regression from #4122

Reported in https://community.mybb.com/thread-233585.html