CreateIdentityWizard: Remove code which allowed the user to choose whether to display images
I decided for removal instead of commenting it out because:
- WOT does not support display of user-generated images yet and probably will not any sonn. 
- If we add support, the code can easily be recreated by copy-pasting the code for choosing whether to enable publishing of the trust list [or by remembering about this commit and reverting it].
CreateIdentityWizard: Make sure to log the current user out after having created a new one
LogInPage: Fix redirect after login not working when using addLogInButton()
- This fixes the "Log in" button in the CreateIdentityWizard. Log in did not work at all because the blank redirect URI resulted in the redirect landing at the LogInInWebInterfaceToadlet which would detect that it should be disabled because we ARE logged in and thus redirecting to the LogOutWebInterfaceToadlet, which would undo the log-in.