Fix wiggly horizontal scrolling on iOS.
Fix wiggly horizontal scrolling on iOS.

Fixes #2369.

chrisfried/DIM,delphiactual/DIM,delphiactual/DIM,delphiactual/DIM,bhollis/DIM,DestinyItemManager/DIM,chrisfried/DIM,DestinyItemManager/DIM,delphiactual/DIM,chrisfried/DIM,chrisfried/DIM,bhollis/DIM,DestinyItemManager/DIM,bhollis/DIM,bhollis/DIM,DestinyItemManager/DIM