Update sign-up.jsp

Patch for solve problem with recaptcha over https
NewReCaptcha method in sing-up.jsp changed to newSecureReCaptcha - whatever you use, 9090 or 9091 - captcha always will comes via HTTPS
(http://community.igniterealtime.org/message/238655)
Merge pull request #4 from Fx03nix/patch-1

OF-780: Update sign-up.jsp