Fixes LMS-1740 by activating the zooming diagram with the spacebar.
Fixes LMS-1740 by activating the zooming diagram with the spacebar.

edx/edx-demo-course,ksripathi/edx-demo-course,ksripathi/edx-demo-course,ksripathi/edx-demo-course,ksripathi/edx-demo-course,edx/edx-demo-course,edx/edx-demo-course,edx/edx-demo-course