Improve collapsed drawer height calculations
Improve collapsed drawer height calculations

Fixes #1373 - Reduce height of collapsed map table on iPhone 8

themonki/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,OneBusAway/onebusaway-iphone,OneBusAway/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone