Update ssff-canvas.component.ts
Update ssff-canvas.component.ts

Fix for issue https://github.com/IPS-LMU/EMU-webApp/issues/303
IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp