Suppress some number keys in online altium viewer, to prevent accidentally switching between e.g. schematic and PCB views.
In the Altium online design viewer, the number keys can be used to switch between schematic, PCB and 3D views. When running Firefox on Gnome, switching between virtual desktops with super-1/2/3 seems to deliver the keyup event for that to the website, causing altium viewer to switch modes. This might be a gnome-shell bug, but this script eats up those keyup events to work around this.
