Always display 'lost recovery key?' option (#2745)
* Always display 'lost recovery key?' option
* Use `isLastDevice` it to display only 'enter recovery key' option for verification.
* Update strings. This should fix the wrong term 'passcode' being used in the recovery key screen title.
* Disable 'lost your recovery key?' button while the screen is in a loading state
* Update screenshots
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Co-authored-by: ElementBot <benoitm+elementbot@element.io>
