User can steal session to use the same captcha for registration

Precondition:

• User should be logged out

Test scenario:

1. Right click on "Sign Up" -> select "открыть в новой вкладке"
   Registration form opened in a new page
2. Repeat first step: right click on "Sign Up" -> select "открыть в новой вкладке" to open a new page with registration form
3. Fill out the registration form at the first opened page, with correct Username, Mail, Password and captcha text.
4. Press Sign Up button and receive a message about successful registration
5. Open second registration page and fill it with other(different) correct Username, Mail, Password
6. Use the captcha text from previous registration
7. Press Sign Up button

AR: Message about successful registration received, user is registered
ER: User should received a warning message under captcha text field about wrong text. User couldn't use the same captcha text for different registrations in one session