CreateOwnIdentityWizard: Preseve invalid nicknames when pressing the "Back" button
CreateOwnIdentityWizard: Make validateStepData() robust against future changes of keeping invalid URIs in mIdentityURI
- Currently, we null out mIndentityURI if mInsertURIProblem is non-null. This might change if the wizard receives additional steps and the URI step then has a back button: Then we might want to preserve invalid URIs so pressing the "Back" button won't erase them before you have even noticed that they are invalid because you didn't press "Continue" yet. In that case, this commit would be needed. So I'll better do it now already because I've noticed that it might be necessary when doing the previous commit.
CreateOwnIdentityWizard: Rename mInsertURIProblem to mIdentityURIProblem:
- This variable is set if there is an error parsing mIdentityURI, so it should match the name of it.