CreateIdentityWizard: Remove resolved FIXME
- This variable doesn't exist anymore
CreateIdentityWizard: Name variables "continueForm" instead of "createForm"
- That describes more what it is - the form which is submitted by the "Continue" button
CreateIdentityWizard: Preserve entered data also when the user uses the "Back" button
- To be able to do so, only use one form for both the Back and Continue button. This also simplifies the code a lot.
- addHiddenFormData() now is independent of what the previous/next step is because we don't have separate forms for those anymore.
- Also, I found a way for being able to make the browser always submit a field for checkboxes even if they are unchecked. This fixes the wizard to preserve the checkbox's value as well.