Use wheelDelta instead of delta
Use wheelDelta instead of delta

In Atom 1.19 we changed the scroll handler to use deltaX and deltaY
instead of wheelDeltaX/wheelDeltaY. wheelDelta is larger so this caused
the scrolling speed to slow down. This change in speed was especially
noticable on Linux

brettle/atom,stinsonga/atom,t9md/atom,Mokolea/atom,andrewleverette/atom,andrewleverette/atom,t9md/atom,ardeshirj/atom,ardeshirj/atom,atom/atom,PKRoma/atom,brettle/atom,liuderchi/atom,Arcanemagus/atom,ardeshirj/atom,brettle/atom,liuderchi/atom,atom/atom,Mokolea/atom,andrewleverette/atom,stinsonga/atom,liuderchi/atom,PKRoma/atom,Arcanemagus/atom,stinsonga/atom,Mokolea/atom,stinsonga/atom,liuderchi/atom,t9md/atom,PKRoma/atom,atom/atom,Arcanemagus/atom