When scrolling the project page with a job graph rendered, users using scroll wheels (or similar input devices) may be surprised that once their pointer moves over the job graph, it begin zooming instead of the page scrolling. Disable zooming the job graph with the mouse wheel so that the behavior remains consistent. Zooming is still possible with click/shift-click. Change-Id: Ic3884f1317cb7799e4e387aa51c81c080e028d10