Renames search keyboard return key type to ‘Done’
Renames search keyboard return key type to ‘Done’

Fixes #1028 - Behavior of the new Search UI when you tap the Search button doesn't make sense

cathy810218/onebusaway-iphone,OneBusAway/onebusaway-iphone,cathy810218/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,cathy810218/onebusaway-iphone,themonki/onebusaway-iphone,cathy810218/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone,themonki/onebusaway-iphone