move autoscale div above realtime graph canvas

[#46393831]

IE9 and IE10 don't implement: pointer-events: none

There are more complex solutions that we don't need at this time:

http://www.vinylfox.com/forwarding-mouse-events-through-layers/

http://stackoverflow.com/questions/9385213/how-to-make-internet-explorer-emulate-pointer-eventsnone