Remove stale switch case '3dview' from tracingCommand.
Remove stale switch case '3dview' from tracingCommand.

fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID,fzadow/CATMAID,htem/CATMAID