Mobile/iPhone/iPad: Allow panning of the map

[tordans]

This issue might be part of https://github.com/mapbox/osmcha-frontend – IDK.

Goal: Be able to move the map when using the app with an iPad.

There are Zoom Controls #189 now – thanks @willemarcel –, that allow to zoom in/out.

But panning the viewport still does not work. Instead the webpage is moved.

Video:

https://www.dropbox.com/s/aogtqixf03oh62y/temp-osmcha-panning-RPReplay_Final1583842172.mp4?dl=0

Screenshots

Trying to move the map down

Trying to move the map up