`amp-story-desktop-one-panel` Page tap targets

Tap targets should match the following:
<img width="1270" alt="Screen Shot 2021-06-10 at 1 27 27 PM" src="https://user-images.githubusercontent.com/3860311/121570174-a060d780-c9ef-11eb-9bf2-988882175cde.png">

This issue is for page clicks only. 
Pagination arrow clicks will be part of #34762