wizard: Don't set page during UI setup

Doing so results in us trying to grab focus on continue button and since
that button is not yet realized, it results in key events failing to
call our handler and throwing criticals on console, until user goes to
wizard (and getting continue button, realized).

Not able to handle key events meant that all our custom keyboard
shortcuts (e.g Ctrl+q) didn't work until user went to wizard.

This initialization was redundant anyway since its always done on UI
state change to wizard.