Launch Challenge Dialog buttons should be equal

[gnomadic]

This puts a lot of pressure on cancel - not sure if we just wanna swap the buttons or have them equal size (@mahgillis or @elisemarika how we should layout this one?)

[elisemarika]

let's match designs, which had them equal: https://www.figma.com/file/66Myyf1MVmY8UKv7BrVUa5/MDAO-App-Designs?node-id=4549%3A61876&t=FIzEC01oG01k2Rts-0

[gnomadic]

haha thanks, I couldn't find it in the figma