create wallet: remove back navigation from CreateConfirm and CreateBackup

[MarnixCroes]

Motivation

the wallet is already created, going back makes no sense

as mentioned in #403 (review)

Possible solution

remove the navbar and then add the right spacing

Useful Skills

No response

Guidance for new contributors

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[Jaysinh146]

Hey, I would love to work on this issue. Can I take it?

[isabell-ah]

Hi! I’m new and would love to work on this issue as my first contribution