[e.cash] Typo fix in RoadmapSection styled component

Summary: Component named 'RoadmpaSection' probably should be 'RoadmapSection', rename

Test Plan: @bot preview-e.cash builds successfully

Reviewers: #bitcoin_abc, johnkuney

Reviewed By: #bitcoin_abc, johnkuney

Differential Revision: https://reviews.bitcoinabc.org/D14071