Update Wallet Backup Screen

[matthewhoman]

This PR updates the wallet back up screen to match the latest figma.

Following the theme pattern:

• sets the checkbox theme in the main file

https://www.figma.com/file/7T7GiBEszjus4tpyOAiPaI/GNUS-FInal-Build?type=design&node-id=206-7390&mode=dev